Pacific slope Cretaceous bivalves of the genus Calva

68 Pages·1992·52.3 MB·English

by  L R Saul

,
Pacific Slope Cretaceous Bivalves of the
Genus Calva
L. R. Saul1 and W. P. Popenoe2
CONTENTS
ABSTRACT 1
INTRODUCTION 2
SOURCES OF MATERIAL STUDIED 3
DISTRIBUTION 3
FEATURES MEASURED 9
CHANGES IN CALVA THROUGH TIME 9
SUMMARY 10
ABBREVIATIONS 10
SYSTEMATIC PALEONTOLOGY 10
Genus Calva Popenoe, 1937 10
Subgenus Calva Popenoe, 1937 12
Calva {Calva) heliaca, new species 12
Calva {Calva) regina Popenoe, 1937 13
Calva {Calva) campanae, new species 15
Calva {Calva) peninsularis (Anderson and Hanna, 1935) 17
Calva {Calva) varians (Gabb, 1864) 19
Calva {Calva) baptisia, new species 24
Subgenus Egelicalva, new subgenus 26
Calva {Egelicalva) byblidis new species 27
Calva {Egelicalva) nitida (Gabb, 1864) 27
Calva {Egelicalva) spissa, new species 32
Calva {Egelicalva) taffi (Anderson, 1958) 34
Calva Egelicalva buttensis (Anderson, 1958) 36
( )
Calva {Egelicalva) bowersiana (Cooper, 1894) 39
Calva {Egelicalva) crassa, new species 44
Subgenus Microcalva, new subgenus 48
Calva {Microcalva) elderi, new species 48
Calva Microcalva haggarti, new species 50
( )
Subgenus Penecallista, new subgenus 53
ACKNCOaWlvLaE{DPeGneMcEalNliTstSa) marina, new species 5537
LITERATURE CITED 57
LOCALITIES CITED 60
ABSTRACT.Calvaisthecommon,veneridbivalvegenusofshallowwaterNorthAmericanPacificSlope
Cretaceous deposits. Sixteen species placed in four subgenera range in age from Albian through latest
Maastrichtian.Sixspecies{Calvaheliaca,newspecies,Cenomanian;C. reginaPopenoe, 1937,Turonian;
C. campanae, new species, late early to late Campanian; C. peninsularis (Anderson and Hanna, 1935),
latest Campanian-early Maastrichtian; C. varians (Gabb, 1864), mid and late Maastrichtian; and C.
baptisia, new species, latest Maastrichtian) constitute the typical subgenus and give it an age range of
Cenomanian through Maastrichtian. Seven species {Calva byblidis, new species, early Albian; C. nitida
(Gabb, 1864), late Albian-Cenomanian; C. spissa, new species, Turonian; C. taffi (Anderson, 1958),
Coniacian-Santonian-earliestCampanian;C.buttensis(Anderson,1958),earlyCampanian;C.bowersiana
L Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, California 90007.
2. Department of Earth and Space Sciences, University of California-Los Angeles, Los Angeles, California 90024.
(Deceased 1981.)
Contributionsin Science, Number 433, pp. 1-68
Natural History Museum of Los Angeles County, 1992
(Cooper, 1894), late early-late Campanian; and C. crassa, new species, early Maastrichtian) constitute
the new subgenus Egelicalva,giving it an age range ofAlbian through early Maastrichtian. Calvaelderi,
newspecies,Coniacian,andC.haggarti,newspecies,Campanian,constitutethenewsubgenusMicrocalva,
andCalva marina,newspecies,lateCampanian-earlyMaastrichtian,istypespeciesofthenewsubgenus
Penecallista.
Although there is no obvious directional change in the external morphologic featuresstudied,thereis
evidenceofatrendinhingemorphologyintheevolutionarylineagesofCalvathatisapparentlytraceable
through the Late Cretaceous.
The restricted age ranges of species in these lineages makes them useful in dating deposits of Late
Cretaceous age. In addition, the typical subgenus has a more southern distribution than the subgenus
Egelicalva,suggestingthatchangesin theirdistributionsthroughthe LateCretaceousmayaid inclimatic
reconstructions.
;
INTRODUCTION scribed from the Upper Greensand of Blackdown,
Devon, England, but in 1903 he referred them to
Venerid bivalves,especiallyofthegenusCalva,are Meretrix nitida Gabb, 1864, a species oflatest Al-
a common constituent of shallow water Late Cre- bian and Cenomanian age. Whiteaves’ material is
taceous marine faunas of the Pacific Slope from presently only partially available, but his Cytherea
Alaska south to Baja California. Two species of (C.) plana and M. nitida are Calva. Some of his
Calva, Meretrix nitida Gabb, 1864,and Venus va- figured specimens have been misplaced, and the
rians Gabb, 1864, were among the earliest de- horizonand localityfora numberofhis specimens
scribed bivalvesofCretaceousagefromCalifornia. are imprecise.
However, these and other species of Calva have The first step toward discriminating between
been imprecisely diagnosed and their geologic oc- Gabb’sspeciesandassigningthemtoanappropriate
currences incorrectly recognized, in part because genuswas made byStewart(1930)who figuredone
severalspeciesarequitesimilarandeasilyconfused. ofGabb’soriginalspecimensofVenus variansand
With careful discrimination the species can be use- designatedANSP4383aslectotype.Hefiguredtwo
ful in dating beds of Late Cretaceous age. Most of Gabb’s specimens of Meretrix nitida but des-
species of Calva from northeast Pacific Slope de- ignated neither as lectotype. He considered that V.
posits appear allocatable to two lineages or sub- varians and M. nitida might be conspecific but
genera. Geographic occurrences of these two sub- noticedsubtleshapedifferencesbetweenspecimens
genera,CalvaandEgelicalva,suggestthatthetypical ofthetwoseparatelots. Hepartiallyexposedhing-
lineage was more thermophilic than the other. es of both species, showing that anterior lateral
Popenoe (1937) proposed the genus Calva to teeth are present in both, and, therefore, referred
include several Pacific Slope Cretaceous venerid both species toAphrodina Conrad, 1869. He con-
species of medium to large size. He designated as sidered the type locality of both to be Martinez,
type species Calva regina Popenoe, 1937, of Tu- Contra Costa County, California, but commented
ronianage,and referredMeretrixnitidavar. major that the striking differences in preservation might
Packard, 1922 = Cucullaea bowersiana Cooper, indicate that more than one stratum and perhaps
1894, to Calva. He also tentatively included two morethanonelocalitywasincludedunderthename
much-cited speciesdescribed byGabb in 1864, Ve- “Martinez.” He dated the Cretaceous fauna from
nus varians and Meretrix nitida, although at that “Martinez” as Cenomanian or earlier, an age ap-
time(1937)neitherthemorphologynorstratigraphic propriatetoM. nitida,butnotforV. varians,which
occurrence of either species was clearly under- is now known to be of Maastrichtian age.
stood. Gabb (1864) cited the two species as occur- Popenoe(1937,p.395)indicatedthatVenusvar-
ring together at four California localities: Cow ians,Meretrixnitida,M.nitidavar.majorPackard,
Creek, Shasta County; Orestimba Canyon, Stanis- and C. regina Popenoe differ from Aphrodina in
laus County; Chico Creek, Butte County; and Di- having posterior lateral teeth. At this time, he also
vision A at Martinez, Contra Costa County, and tentativelyassignedMeretrixumzambiensisWoods,
the two species have continued to be jointly cited 1906,fromtheLateCretaceousofPondoland,South
from numerous Cretaceous localities by many Africa, to Calva, being unaware that M. umzam-
workers up to thepresent. Gabb did not designate biensis had been designated type species of Tri-
type specimens or type localities and gave no ex- gonocallista Rennie, 1930 (p. 177). Upon discov-
planation for placing V. varians and M. nitida in eringRennie’sdesignation,Popenoesentspecimens
differentgenera. Heprovided no description ofthe of Calva to Rennie at Rhodes University College,
hinge of either species. Grahamstown,SouthAfrica.RennieopinedthatT.
Whiteaves (1879) originally identified specimens umzambiensis was congeneric with the California
that should probably be referred to Calva from specimens,andPopenoe(1940)placedCalvainthe
several localities in the Nanaimo Basin deposits, synonymyofTrigonocallista. Casey(1952,p. 172),
British Columbia, as Cytherea Caryatis plana however, recognized both genera because Calva
( )
Sowerby, 1812, a species of late Albian age de- was described as having smooth sided anteriorlat-
2 Contributions in Science, Number 433 Saul and Popenoe: Pacific Slope Calva
eral teeth, whereas Trigonocallista has striated an- have been made include the Nanaimo Basin [1-3]
teriorlateralteeth. He considered them both to be in southern British Columbia and San Juan Co.,
dosiniopsids. Washington; the Hudspeth Formation in Wheeler
Anderson(1958,p. 138)providedtwonewnames and Grant Cos. [4], Oregon; the Hornbrook For-
for species ofCalva collected at Chico Creek and mationinJacksonCo.[6],OregonandSiskiyouCo.
figured by Taff et al. (1940): Trigonocallista taffi [7], California; the Jalama Formation in western
Anderson for T. nitida (Gabb) (Taff et al., 1940, Santa Barbara Co. [22], California; the Point Loma
pi. 2, figs. 3-4) and T. buttensis Anderson for T. Formation ofthe Rosario Group in San Diego Co.
varians(Gabb) (Taffetal., 1940,pi. 2, figs. 10-11). [28], California; and the Rosario Formation in
Seven of the 15 species referable to Calva s.l. northern Baja California, Mexico [29].
that are present in northeast Pacific Slope Creta- Type specimens of the named taxa were bor-
ceousbedswerenamedpriortothisstudy.Tothese rowed. If preservation of the specimen was ade-
areadded nine newspecies,givingthegenusatime quate and permission was granted by the loaning
range in this region of Albian through Maastrich- institution, matrix was removed so that the hinge
tian. In the past generic and specific relations have teeth could be seen. New collections from type
been obscured by incomplete knowledge of mor- localities of described species have made possible
phology of some species, careless identification of assessments of the range of variation in these spe-
many specimens, and resultant confusion of the cies. Although the type localities of species de-
stratigraphic occurrences of species. This paper scribed by Gabb and Cooper lack precision, com-
summarizesthe species comprisingCalva and their parisonoftypematerialwithlargecollectionsfrom
morphologic, geographic, and stratigraphic dis- the vicinity of the “type locality” has made it pos-
tinctness. This work was begun by W. P. Popenoe sible to assign these species to descrete horizons.
whogaveapaperonCalvaatthe 1963Cordillerian Taxa included in Calva, especially Venus varians
Section of the Geological Society of America (Po- andMeretrixnitida,havebeenreportedfrommany
penoe, 1964, p. 219) and has been completed by localities; reassessment of reported identifications
L. R. Saul. hasbeeneffectedbyexaminingthespecimensupon
which the reports were based and/or by studying
SOURCES OF MATERIAL STUDIED larger, better located collections from the area.
Calvas most commonly occur in sandstone de-
During the years that he studied the Late Creta- posits. Where specimens are not obviously dis-
ceous molluscan faunas from the Pacific Slope of placed downslope, the conditions appear to have
North America, Popenoe amassed collections that been normal marine and sublittoral, nearorbelow
were carefully located geographically and strati- wave base. Calva is commonly part of a fairly di-
graphically,manyofwhichcontainedspecimensof versemolluscanassemblagethatlivedoff-shorefrom
the venerid bivalve Calva. Figure 1 indicates areas communities dominated by Cymbophora and in
from which such specimens have been collected, slightlycoarsersubstratethanthoseinwhichCras-
andlocalitiesarekeyedtoitbyabracketednumber. satella was most abundant. Although common in
Aframeworkforthestudyofthisgroupisprovided manycollections,Calvadoesnotusuallyconstitute
by several important sections. The Cretaceous sec- more than a third ofrecoveredspecimens. In com-
tionsatthe northern end oftheSacramentoValley parisontosomethinnershelledbivalvesinthesame
in the vicinity of Ono [9] and east of Redding [8], deposits, specimens of Calva, which are relatively
ShastaCo.,comprisingtheBuddenCanyonandthe robust, probably have a better recovery rate from
ReddingFormations,haveprovidedveneridsofAl- hard matrix and are therefore disproportionally
bianthroughSantonianage.OutcropsoftheChico abundantinmuseumcollections.AlthoughallCal-
Formation,especiallyalongChicoCreek[11],have va have a well-developed pallial sinus and were
providedveneridsofSantonianthroughearlyCam- doubtless infaunal filter-feeders, shell morphology
panian age. The Santa Ana Mountains [26] section andthetypicallydisarticulatedpreservationofshells
in Orange Co., comprising the Ladd and Williams indicate that Calva was probably a shallow bur-
Formations, has yielded venerids of Turonian and rower.
late Campanian age. In the Simi Hills [24] of Los
Angeles and Ventura Cos., the Chatsworth For- DISTRIBUTION
mation has yielded venerids of mid-Campanian
through early Maastrichtian age. Although mega- In addition to the fourPacific Slope species, Venus
fossilsare sparse in much ofthe thick GreatValley varians, Meretrix nitida, Cucullaea bowersiana,
Seriescroppingoutalongthewesternborderofthe andCalvaregina,Popenoe(1937,p.395)suggested
San Joaquin-Sacramento Valleys, the region has that Meretrix umzambiensis from South Africa,
provided venerids of Albian through late Maas- Cytherea subrotunda Sowerbyand Cytherea cape-
trichtianage.NorthandsouthofLakeNacimiento rata Sowerby from England, Dosiniopsis nebras-
[21] in San Luis Obispo Co., outcrops of the El censis(Meekand Hayden, 1856) fromtheWestern
Piojo Formation have yielded late to latest Maas- Interior, and Callista pseudoplana Yabe and Na-
trichtian venerids. gao, 1925, from Hokkaido, Japan, might be re-
Other areas from which important collections ferred to Calva. The generic placement of M.
Contributionsin Science,Number433 Saul and Popenoe: Pacific Slope Calva 3
———— —————
Figure 1. IndexmaptogeographicoccurrencesofCal-
vaspp.Localitiesaregrouped—into33areasthatarenum-
bered from north to south: 1 Denman Island, Hornby
—
5Is—land, and Texada Island, British Columbia. 2 Depar-
tureB—ayandNanaimo,VancouverIsland,BritishC—olum- !
bia.3 SuciaIsland,SanJuanCo.,Washington.4 Day- I
ville,GrantCo.,and RockCreek,WheelerCo.,Oregon.
AndyBernardRanchandSuplee,CrookCo.,Oregon.
6 Ash—land Creek and Jacksonville, Jackson Co., Ore-
gon. 7 Rancheri—a Gulch and Young Ranch, Siskiyou
Co.,California.8 CloverCreek,CowCreek,DryCreek,
Oak Run, Price Hollow,—Redding, and Stinking Creek,
Shasta Co., California. 9 North Fork of Cottonwood
Cre—ek, Ono, and Texas Springs, Shasta Co., California.
10 Elder Creek, Tehama Co., California. 11—Butte
Creek, Chico Creek, and Pentz, Butte Co.,—California.
12 Stony Creek, Glenn Co., California. 13 Antelope
Creek, Peterson Ranch, and Sites, Colusa Co., and
—
ThompsonCreek,YoloCo.,California. 14 Beniciaand
—
Glenn Cove,SolanoCo., California. 15 CurryCanyon,
DeerValley,and Martinez,ContraCostaC—o.,andPleas-
anton area, Alameda Co., California. 16 Bolsa Point,
SanMateoCo.,California.17-—GarzasCreek,Orestimba
Creek,andSaladoCreek,StanislausCo.,California.18
Laguna Seca, Los Banos Creek, Pachec—o Pass, and Orti-
galitaCreek,MercedCo.,California.19 Coalinga,Coo-
per Canyon, Los Gatos Creek, Fresno Co., California.
20 GarzaPeak,McClureRidge,northofSunflowerVal-
ley,KingsCo.,California.21—CantinasCreek,DipCreek,
LakeNacimiento,San LuisObispoCo.,California.22— ;
Jalama Creek, Sisquoc River, Hurricane—Deck Quadran-
gle, Santa Barbara Co., California. 23 Warm Springs
Mountain,LosAngelesCo.,California.24-—BellCanyon, |
SimiHills,VenturaCo.,andDaytonCanyon,LosAngeles
—
Co.,California—.25 SantaMonicaMts.,LosAngelesCo.,
California.26 Bakerand BlackStarCanyons,BeeCan-
yon, Holz Ranch, Pankratz Ranch, Wildcat and White
Canyons,andWilliamsCanyon,SantaAna Mts.,Orange
Co., California. 27—Carlsbad area, San Diego Co., Cal-
ifornia. 28—La Jolla and Point Loma, San Diego Co.,
Cal—ifornia. 29—Punta Banda, Baja California, Mexico—.
30 SanAntoniodelMar,BajaCalifornia,Mexico.31
Vicinity of El Rosario and Arroyo Santa Catarina, Baja
California, Mexico. 32—Cedros Island, Baja California,
Mexico. 33—Northwest Vizcaino Peninsula, Baja Cali-
forniaSur, Mexico. 34—VizcainoPeninsulainlandfrom
PuntaAbreojos,BajaCaliforniaSur,Mexico.Placenames
mentioned in text listed alphabeticallyand assigned toa
numbered—area: 5—AndyBernar—d Ranch; 13—Antelope
Creek;15 ArroyodelValle;31 ArroyoSantaCatarina;
613——Ashland Creek; 26—Baker Canyon; 26—Bee Can-
yon;24—BellCanyon;14—Benicia;26—BlackStarCan-
yon; 16—Bolsa Point; 11—Butte Creek; 21—Cantinas
Creek; 27—Carlsbad; 32—Cedros Island; 11—Chico
— — —
Creek; 8 Clover Creek; 19 Goalinga; 19 Gooper
— —
Canyon; 8 Cow Creek; 15—Curry Canyon; 24 Day-
ton Canyon;4—Dayville; 15—DeerValley; 1—Denman
2Is1landD;i2p—CrDeeepka;rt8ur—eDBrayy;Cr17e,ek1;8,1109—,2E0ld—erDiCarbeleok;Ra3n1ge—;
El Rosario; 20—Garza Peak; 17—Garzas Creek; 14
GlennCove;26—Holz Ranch; 1—HornbyIsland;22
Jalama Creek; 6—Jacksonville; 18—Laguna Seca; 28
km L1a—9—JoLlloas;G2a1to—sLCar—keeek;Na1c5i—miMeanrttoi;ne1z8;——20T—osMcBCalnuorseCRriedegke;;
0 100 250 500 750 _ 1000 2 Nanaimo;15 —NilesCanyon;—9 North—ForkofCot-
tonwoodCreek; 8 Oak Run;9 Ono; 17 Orestimba
Creek; 18—Ortigalita Creek; 18—Pacheco Pass; 26
Pankratz Ranch; 21—Pebblestone Shut-In; 11——Pentz;
Peterson Ranch; 15—Pleasanton area; 28 Point
4 Contributions in Science,Number 433 Saul and Popenoe: Pacific Slope Ca/va
— — ——
,
umzambiensis has already been mentioned. Casey deposits of Coniacian, Santonian, and early Cam-
(1952)consideredCythereasubrotundatobeatyp- panian age of Southern California were laid down
icalCalvaanddesignatedCythereacaperataasthe in moderately deep or deeper water and have as
typespecies ofChimela,anew subgenus ofCalva. yet yielded no specimens of Calva.
Speden (1970) consigned Dosiniopsis nebrascensis ThephylogeneticrelationshipbetweenCalvas.s.
tothesynonomyofD. deweyi(Meekand Hayden, and Calva (Egelicalva) is not known. Egelicalva
1856) and considered the species appropriately appears in our records before Calva (Calva), and
placed in Dosiniopsis therebyextendingthe range the shape of the earliest typical Calva, C. (C.) he-
ofDosiniopsis back into the Late Cretaceous. Na- liaca, which is probably of Cenomanian age, re-
gao and Otatume (1963) placed Callista pseudo- semblesthat ofC. (E.) tafp ofSantonian age rather
planaYabeandNagao, 1925,inAphrodina. Haya- than C. (£.) nitida of latest Albian-Cenomanian
mi (1975,p. 145) questionablyrefered Dosiniopsis ageorC.(E.)byblidisofearlyAlbianage.NoCalva
(?)cf.D.(?)caperata(Sowerby)ofYabeandNagao, s.s. species can be unequivocally derived from a
1925, from the Cape Khoi beds (Cenomanian-Tu- speciesofEgelicalva, butCalvaandEgelicalva are
ronian) in the Aleksandrovsk area, Sakhalin Island, so similar in hinge structures and shape that they
Russia, to Calva sp. In contrast, Trigonocallista are probably related.
ornataIchikawaand Maeda, 1963, from the Izumi Whiteaves(1879,p. 150;1903,p.377)listedspec-
Group(Campanian)inthe Hiketaarea,Tokushima imens that would now be assigned to Calva as
Prefecture, Japan, has the striated nymph of a Cytherea Caryatis planaSowerbyorMeretrixni-
( )
Trigonocallista.OnlyspeciesfromthePacificSlope tida Gabb from several Nanaimo Basin [1-3] lo-
can with certainty be assigned to Calva. calities. Unfortunately, not all ofhis specimens are
ThegenusCalvapersistedalongthePacificSlope available.HislocalitiesincludedDepartureBay,near
ofNorthAmericafromAlbianthroughMaastrich- Nanaimo, northwest side of Hornby Island, “214
tian but does not appear to have been common miles up the Nanaimo River,” Texada Island, and
elsewhere. Figure2plotschronologicrangesofthe Sucia Island. Work of Muller and Jeletzky (1970),
studied species. Calva has been recognized from Ward (1978), and Haggart (1989) suggests that
Alaska south to the Vizcaino Peninsula [34], Baja Whiteaves’ localities on Sucia Island, Texada Is-
California Sur, Mexico. Only a few Alaskan spec- land, “214 miles up the Nanaimo River,” and pos-
imens, mainly from the Campanian Chignik For- sibly near Nanaimo are from the Cedar District
mation west of Chignik Bay, have been studied. Formation; localities at Departure Bay and near
Reports (Whiteaves, 1879, 1895, 1896, 1903) in- Nanaimo may have been from the Pender or Has-
dicated that Calva is common in Late Cretaceous lamFormations,andtheNorthumberlandandSpray
deposits of southern Vancouver Island [1-2], Brit- Formations are mapped on the northwest side of
ishColumbia,butfewspecimensareavailable,and Hornby Island. The Cedar District Formation is
Nanaimo Basin Calva are represented in this study consideredtobeofearlylateCampanianageHopli-
mainly by Campanian, Hoplitoplacenticeras van- toplacenticeras vancouverense and Metaplacenti-
couverense Zone, specimens from Sucia Island [3], ceras pacificum zones; Calva from this formation
Washington.MostofthespecimensfromBajaCal- on Sucia Island are Calva Egelicalva bowersiana
ifornia, Mexico, are from the Rosario Formation andCalva(Microcalva)hag(garti.Weh)avenotseen
andare ofearly Maastrichtian age, buta fewspec- specimens from Departure Bay or near Nanaimo;
imens from formations as old as Cenomanian are theagerangeoftheHaslamandPenderFormations
available.Californiahasprovidedthe bulk ofspec- is late Santonian to early Campanian (Ward, 1978;
imens and species over the most extensive time Haggart, 1989). In California, beds of late Santon-
range and the best geographic distribution. How- ian age have yielded C. (£.) tafp, and beds of early
ever, Albian and Cenomanian deposits are un- CampanianagehaveyieldedC. (£.) buttensis. Four
knowninSouthernCalifornia,andthemoststudied small specimens from Hornby Island identified by
Whiteaves as Meretrix nitida Gabb are similar to
Calva Microcalva haggarti, new species (see the
( )
discussionunderthisspecies);Northumberlandand
8— — — lowerSprayFormationsareoflateCampanianage,
Loma; PriceHollow;34 PuntaAbreojos;31 Pun-
ta Baja; 29—Punta Banda; 17—Quinto Creek; 7—Ran- and the upper Spray is early Maastrichtian in age
cheria Gulch; 8—Redding;4—Rock Creek; 17—Salado (Haggart, 1989).
!I Cvorier—e;k2;23—0S—anSaRnafAanetlopnriiomidteilv—eMaarrea;;2186——SSaanntaLuAinsaReMstesr.-; eacFhigusrpeeci3esd.epCihcrtsontohleogkincowanndlagteiotgudrianpahlicranrganegeosf
2vi5de;S2a6nt——aSiMlovneiracdaoCMtasn.y;on2;62—4S—anStiimaigHo—i-lAllsi;s7o—CrSeisekkiydoiu- aorfetbhaeseNdatluarraglelyHiosntorsypeMciumseensuminotfheLocsollAencgteiloenss
M1t2s.—; 22 Sisquoc R—iver; 13 Sites; 8—Stinking Creek; County,theUniversityofCalifornia,Berkeley,Mu-
Tlceahyi;on5moSpPtesoSnonuinypnlseCuCelrr;aee;e1ek2k;—3;—'T32eW—xaaSVduraacminIacsSolpIarusnivldnae;gnrsd9;MIos2uTl0anentxdaa;Sisun3Sn;3pf,r2li6on3wg—4se;—rWh1VV3iaitlze-- sooffeutSmhcieoefUn.cPSea.sl,eGwoeinottloholgaoidgcdyai,ltaiSonundravltehyde,aCtMaaelinfflrooormniPaacroAlkcl,eacRdtoeiyomanyls
| Canyon;26—WildcatCanyon;26—WilliamsCanyon;7 ProvincialMuseum,Victoria,BritishColumbia,and
Young Ranch. Geological Survey of Canada, Ottawa, Ontario.
Contributionsin Science, Number433 Saul and Popenoe: Pacific Slope Calva 5
Ma Magnetic AGE Calva Ammonites
Polarity
a
2 .JO 1
60- Polarity Reversal CHRON 1O 2 !c TO§g
§ 0) §
PALEOCENE Uj CL
mm
27 C27
Danian •a
— 28 C28 t
29 C29 .
12 - I
C30
nr\
3
C31 to o
Maastrichtian
i
o' I
C32 cc )
oK
S £
N .5
o
C33
M
Campanian .JO ° :
i3fcoj
I
i*
Santonian
CRETACEOUS \ UJ, 9
S
Coniacian m
90- Turonian ft £
N 6
uj
i.
Cenomanian
\ :$
c
C34
^
LNUJ
100-
Albian
!
i OQ
110-
Figure2. GeologicrangesofspeciesofCalvafromthePacificSlopeofNorthAmericaplottedagainstgeochronologic
time scale, magnetic polarity (after Palmer, 1983), and selected ammonite ranges.
6 Contributions in Science,Number 433 Saul and Popenoe: Pacific Slope Calva
E
Figure 3. Latitudinal distribution of species of Calva and Egelicalva, based on range end points of Table 1. All
occurrencesofC. (C.)regina,C. (C.)campanae,andC. (C.)baptisiaarewestoftheSanAndreasfault.Alloccurrences
ofC. (£.)byblidis,C. ( .)spissa,C. (£.)taffi,andC. (£.)buttensisareeastoftheSanAndreasfault.Thenorthernmost
occurrenceofC. (C.)heliaca,C. (C.)peninsularis, C. (£.) nitida,C. (£.)bowersiana,andC. (£.) crassais eastandthe
southernmostoccurrencewestofthefault.Northernrangeendsarerounded-offnorthandplottedonthenextnorthern
quarter degree; southern range ends are rounded-off south and plotted on the next southern quarter degree. Species
known only from essentiallya single localityaregiven a latitudinal range ofone degree.
Contributionsin Science,Number433 Saul and Popenoe: Pacific Slope Calva 7
Table 1. Range end points for Calva species.
Northern end point Southern end point
Calva (Calva)
NW
heliaca 36°N, McClure Ridge [20] 27°45'N, Vizcaino Peninsula[33]*
regina 37°15'N, Quinto Creek [17] 28°N, Cedros Is. [31]*
campanae 34°15'N, Simi Hills [24]* 26°45'N, Vizcaino Peninsula [34]*
peninsularis 36°N, Coalinga [19] 29°30'N, Santa Catarina[31]*
varians 38°N, Martinez [15] 35°45'N, Lake Nacimiento [21]*
baptisia 35°45'N, Lake Nacimiento [21]* 34°30'N, Warm Springs Mtn. [23]*
Calva (Egelicalva)
byblidis 40°30'N, Texas Springs [9] 39°30'N, Sites, Colusa Co. [13]
nitida 44°N, Suplee, Oregon [5] 38°N, Martinez [15]
spissa 42°15'N,Jackson Co., Oregon [6] 36°N, Garza Peak [20]
taffi 40°30'N, Redding [8] 37°15'N, Orestimba [17]
buttensis 56°30'N, Chignik Bay, Alaska 39°50'N, Pentz [11]
bowersiana 49°30'N, VancouverIs. [2] 33°30'N, Santa Ana Mts. [26]*
crassa 37°N, Ortigalita Creek [18] 31°45'N, Punta Banda [29]*
Calva (Microcalva)
elderi 37°N, San Luis Reservoir[18]
haggarti 49°30'N, Vancouver Is. [2] 48°45'N, Suicia Is. [3]
Calva (Penecallista)
marina 35°45'N, Pebblestone Shut-In [21]* 31°N, San Antonio del Mar[30]*
*West ofthe San Andreas Fault.
These compiled latitudinal ranges (Table 1) are fil- specimens were collected. The best documented
teredthrough the usual deficienciesofthegeologic displacements are those of the San Andreas Fault
—
record incomplete sections, wrong ecotope pre- system,whicharerelativelynorthwardonthewest.
served,andimperfectpreservationofspecimens,as Some species have their entire geographic occur-
wellastectonictransport. Howeverwarped bythis rence eithereast orwest ofthis system, but others
filter, the occurrences ofCalva (Calva) and Calva straddle it. Calva (C.) peninsularis, C. (Egelicalva)
(Egelicalva) form a north-south pattern with spe- bowersiana,andC. (£.) crassaallhavetheirsouth-
cies of Calva (Calva) displaying a more southerly ernmost occurrence to the west of this system, on
distribution vis a vis contemporaneous species of the north moving block, and their northernmost
thesubgenusEgelicalva.AvailableAlaskanandCa- occurrence east of the system. Their present ap-
nadian collections surveyed suggest that many parent latitudinal range is less than their original
northern occurrences are unreported. Both the distribution by the total displacement on the San
northerly distribution of several species of Egeli- Andreassystem(approx.500-600km). Despitedis-
calva and the southerly distribution of species of tributional offset due to terrane displacement, lat-
Calva s.s. are likely to be extended by additional itudinal ranges of time equivalent species of the
collecting. In general, specimens of Calva (Egeli- Calva s.s. group are to the south of the ranges of
calva) sp. show more accentuated growth checks theCalva(Egelicalva)group.Anyterranedisplace-
thandospecimensofCalva(Calva)sp.Asstrength mentsacrosstheSanAndreassystemappeartohave
of growth checks may be encouraged by a more beenlessthantheoriginallatitudinalrangesofthese
seasonal climatewith greatersummer-winterfood species.
supply differential affectinggrowth potential, spec- Latitudinal ranges in the Cretaceous may have
imens from higher latitudes might be expected to been broad, but the pattern of the Calva ranges
exhibit stronger growth checks. argues for latitudinal restrictions not too unlike
Actual latitudinal ranges have not only been ob- thoseofthepresentNorthAmericanPacificCoast.
scured by deficiencies of the geologic record but Sliter (1968), dealing with foraminiferal faunas of
have been additionally confounded by the un- earlyMaastrichtianage,postulatedfourmarinecli-
known amount of terrane displacement between maticzonesremarkablysimilartothoseofthepres-
various Calva-bearing outcrops of similar age. Pa- ent. The molluscan equivalent of his south-central
leomagnetic data suggest a northward translation fauna includes such tropical forms as the rudist
ofmanyoftheCretaceousdeposits(Fryetah,1985), bivalve Coralliochama but would be equated to a
but the Figure 3 ranges are plotted at the present modernwarm temperateratherthanatropicalfau-
geographic positions of the rocks from which the na. Although the subgenus Egelicalva is of more
8 Contributions in Science, Number 433 Saul and Popenoe: Pacific Slope Calva
)
northern distribution, its range probably extended
southintothenorthernpartofthewarmtemperate
zone.Thesouthern distributionsofCalva [E.) taffi
and C. (£.) buttensisareprobably truncated bythe
lack of beds bearing Calva of early Senonian age
south of Stanislaus Co. [17], California, and the
northward distribution of C. (£.) crassa may also
be more reflective of geologic preservation than
original distribution. None of the faunas in which
Calva is present appear to be truly tropical. But
some, e.g., northern California Albian, Oregon
Cenomanian, northern California Turonian, and
southern California late Campanian, include a few
generaoftropicalaspect,suggestingthatthesewere
warmtemperatefaunas. Ifthe distributionsofCal-
va [Calva) spp. and Calva [Egelicalva spp. are in
parttemperature dependent, the ranges in Figure 3
suggestawarmTuronian followed byacoolerCo-
niacianandSantonian.ThelateCampanianappears
to have been slightly warmer than the early Cam-
panian.Theearly Maastrichtianmayhave beenthe
coolest interval, but it was followed by a consid-
erable late Maastrichtian warming.
FEATURES MEASURED
In addition to the usual three measurements taken
on bivalves, (1) valve height (H), measured perpen-
dicular to the ligament, (2) valve length (L), mea-
suredparalleltotheligament,and(3)valveinflation
(tlIua),nnucfleoeufrlreoonmtghtehtrh(eLmLeb)ae;sa(uk3r)etlomuentnuhtleseawwnietdrerteihomr(aLdeWen):d;(((1B4)));dti(hs2e-) [[liPCceaanllevvcaaa)llpciersnatiasn)ssaumlwaairrtiihns,ac,aanrlddeifnlteaflvtavtleaveletvheaniltnaetbreeirloierodrvoaifnedCwamolefvaaCs[auElrgveead-
angle made by drawing lines through lateral teeth features) indicated. H, height measured perpendicular to
(LTA) All and PII or sockets for All and PII. The theligament;L,lengthmeasuredparalleltotheligament;
number of specimens measured ranged from only I,inflationofasinglevalve; B, distancefromthe beak to
2 specimens of C. Microcalva elderi to 16 of C. theanteriorend; LL, length ofthe lunule; LW,width of
[Egelicalva)taffiand( dependedu)ponavailablespec- the lunule; LTA, lateral tooth angle, the angle made by
imens of sufficient completeness and the amount drawingalinethroughthesocketsforthelateralsAlland
oftimerequiredtoremoveobscuringmatrix.Figure PPIIII iinn tthheerleifgthtvavlavlev.eMoeratshurroeumgehnttheLlTaAteruasletdeeatshaAnllalatenrd-
4 diagrams the features measured on specimens of native to beak angle, which is more difficult to measure
Calva. Figure 5 compares ratios of these measure- consistently.
ments and the angle through the lateral teeth. Al-
though these measurements show specific differ-
ences, they provide no directional trends in these
lineages. are species of other subgenera of Calva and are
comparable to Microcallista in size. Calva [Calva)
CHANGES IN CALVA THROUGH TIME heliacaofCenomanianageandC.[E.)taffiofConi-
acian-Santonian age are represented by smaller
Most of the changes recognized between species specimens than are other species of their lineages.
appear undirected within lineages. Even size does Only in the hinge do some developmental trends
not increase regularly. The largest species, Calva appear. The anterior laterals become shorter and
[Calva) peninsularis, C. [Egelicalva) crassa, and smoother, losing the striation of the early species.
Calva (Penecallista) marina, are all ofearly Maas- Cardinal tooth 1 moves dorsally from its earlypo-
trichtian age. Some specimens of Cenomanian age sition at the hinge plate edge with its dorsal end
C. (£.) nitidaare largerthan any known specimens ventral to that of 3a, whereas in later species its
ofTuronianage C. (£.) spissa, Coniacian-Santoni- dorsalendisinamorebeakwardpositionthanthat
an age C. (£.) taffi, or early Campanian age C. (£.) of 3a, and its ventral end is no longer at the hinge
buttensis some specimens of late Campanian C. plate edge. In C. (C.) heliaca cardinals 3a and 3b
;
(£.)bowersianaapproachthesizeofC. (£.)crassa. are connected dorsally by a low arched ridge; in
Late Maastrichtian Calva are of average size. Spe- later species this connection is broken as 1 moves
cies of Microcalva are considerably smaller than into its more dorsal position.
Contributionsin Science,Number 433 Saul and Popenoe: Pacific Slope Calva 9
SpeciesorCalva UH u\ US LL/LW
groupedbysubgenus
withinsubgenusin moreelongate moreinflated shorteranterior narrowerlunule
stratig'-'phicorder
9 1.0 1.1 1.2 1.3 2.63.03.4 3, 1.82.02.2 2.42.6 2.8
i l l i I I I I I I I I I I I I I I I
Calva(Catva)baptisia 1
varians Li
peninsularis
campanae 3
tF
regina
heliaca 3
Calva(Egelicalva)crassa zm m
irn
bowersiana
buttensis m
taffi m,
spissa
nitida
byblidis
Calva(Microcalva)haggarti
elderi S3
Calva(Penecallista)marina Z3.
Figure 5. Ratios of measurements made on specimens of 16 species of Calva. Measurements from Tables 2-17.
Features measured are described and abbreviations decrypted in Figure 4.
SUMMARY CSMB California State Mining Bureau
GSC Geological Survey of Canada
AlthoughforthepastcenturyVenusvariansGabb, LACMIP Natural History Museum of Los An-
1864, and Meretrix nitida Gabb, 1864, have ap-
geles County, Invertebrate Paleontol-
peared on faunal lists from the same locality, they
ogy Section
do not occurtogetherand are not ofthe sameage. SDSNH San Diego Society of Natural History
These and 14 other species constitute the genus
SDSU San Diego State University
Calva, which is subdivided into four subgenera, SU (= LSJU) Stanford University (collec-
two of which, Calva s.s. and Egelicalva, range tions now housed at the California
through the Late Cretaceous of the Pacific Slope.
Academy of Sciences, Golden Gate
Species ofCalva are difficult to distinguish but can
Park, San Francisco)
be discriminated and are diagnostic of discrete UCMP UniversityofCalifornia, Berkeley, Mu-
chronologic intervals.
seum of Paleontology
GeographicdistributionsofCalvas.s.andCalva UCLA University of California, Los Angeles
m(Eogreleicnaolvrat)h,erwlyhidcihstrriebsuulttioni,n sEuggegleisctalvthaathatveirnrganea (HciosltloercytiMonussenuomwofhoLousseAdngeatlesNaCtouurna-l
displacementwasnotequaltothelatitudinalranges
ofCalva s.l. speciesand that climaticallytherewas USGS tUyn)itedStatesGeologicalSurvey,Wash-
a Coniacian-Santonian cooling, a warming in the
ington, D.C.
late Campanian, and an early Maastrichtian cool- USGSM UnitedStatesGeologicalSurvey,Menlo
ing, followed byawarmingthrough the lateMaas-
Park, California
trichtian. USNM United States National Museum
Only the hinges of Calva display any evolving
morphologic trends. The anterior lateral teeth be- SYSTEMATIC PALEONTOLOGY
comeprogressivelysmoothersided,andthecentral
cardinal tooth of the left valve moves into a more Phylum Mollusca Linnaeus, 1758
beakward position. Class Bivalvia Linnaeus, 1758
Order Veneroida H. and A. Adams, 1856
ABBREVIATIONS
Family Veneridae Rafinesque, 1815
ANSP Academy of Natural Sciences of Phil- Genus Calva Popenoe, 1937
adelphia
CAS California Academy ofSciences, Gold- TYPE SPECIES. By original designation Calva
en Gate Park, San Francisco regina Popenoe, 1937,Turonian, Ladd Formation,
CIT CaliforniaInstituteofTechnology(col- Holz Shale Member, Santa Ana Mountains, Cali-
lectionsnowhousedatNaturalHistory fornia.
Museum of Los Angeles County) DIAGNOSIS.Veneriformbivalveshavinggrowth
10 Contributions in Science, Number 433 Saul and Popenoe: Pacific Slope Calva