Paleoecologic analysis and age of a late Pleistocene fossil assemblage from upper Newport Bay, Newport Beach, Orange County, California

2005·5.5 MB·English

by  C L Powell

THE VELIGER
© CMS, Inc., 2004
The Veliger47(3):183-192 (March 16, 2005)
Paleoecologic Analysis and Age of a Late Pleistocene Fossil Assemblage
from Upper Newport Bay, Newport Beach,
Orange County, California
CHARLES L. POWELL H,' LISA B. GRANT,- and STEVEN W. CONKLING^
' U.S. Geological Survey, MS 975, 345 Middlefield Road, Menlo Park, California 94025, USA
^Department of Environmental Health, Science & Policy, University of California,
Irvine, California 92697-7070. USA
-' LSA Associates, 1 Park Plaza, Suite 500, Irvine California 92714, USA
Abstract. A new fossil site containing abundant late Pleistocene marine invertebrates was exposed during grading
activities near the northeastern end of Upper Newport Bay, in the city of Newport Beach, Orange County, southern
California. The site has since been destroyed but yielded an assemblage ofat least 103 species, represented by 98 species
of moUusks (54 bivalves, 43 gastropods, and one scaphopod), at least three species of arthropods (barnacles and crabs),
and two echinoids from six spot collections. The composite assemblage from the Fletcher Jones site (Orange County
Paleontological Collections [OCPC] localities 2601 through 2606) represents a mixed thanatocoenosis, including repre-
sentatives from protected bay, sandy-bottom and rocky-bottom, protected to open coasts, and offshore environments.
The percentage (12.6%) of extralimital southern species indicates warmer-water temperatures than presently exist along
the Orange County coast. The age of the fauna (—120,000 yr) is inferred from correlation with similar, U-series dated
faunas from the same marine terrace around Upper Newport Bay. Correlative faunas from nearby localities contain
extralimital southern species, and date to marine oxygen-isotope (5 "*0) substage 5e. Turritella mariana Dall is reported
as a fossil for the first time.
INTRODUCTION AND GEOLOGIC SETTING (Watts, 1900 [in part]; Arnold, 1903; Bruff, 1946 [in
part]; Hoskins, 1957; Kanakoff and Emerson, 1959;
During 1996 and 1997, grading operations for a new car
Mount, 1981; Peska. 1975, 1976, 1984), whereas only a
dealership (Fletcher Jones Motor Cars) (Figure 1) ex- few deal with the cooler-water fauna from the lower and
posed a Pleistocene marine terrace platform overlain by
younger first terrace (Watts, 1900 [in part]; Bruff, 1946
marine sediments containing a diverse marine inverte-
brate fauna. The Fletcher Jones site (now destroyed) was [in part]; Powell, 2001). The Fletcher Jones site lies on
the higher, olderterrace and contains awarm-waterfauna.
a roughly triangular area of about eight acres, between A composite stratigraphic section (Figure 2) consists
Jamboree Road, Bristol Drive and San Diego Creek, at
tNheewpnoorrttheaBsetacehn,d oOfraUnpgpeerCNouenwtpyo,rtsBouatyh,erinn tChaelicfiotyrnoiaf oasf athbeasNailgumealrinFeormsialttistoonne(uunniitt qTune)st(iMonoarbtloynre&ferMrieldlert,o
(Figure 1). The Fletcher Jones site and Upper Newport 1981) orthe Tertiary Unnamed sandstone (Tus) ofVedder
Bay occupy an erosional water gap between the tectoni- and others (1957), overlain by upper Pleistocene marine
cally rising San Joaquin Hills and Newport Mesa. Emer- deposits, fluvial channel deposits, and Holocene (?) al-
gent marine terraces in the northern San Joaquin Hills luvium. The contact between the Niguel Formation (?)
have been dated by --^'*U/--'"'Th analysis of solitary corals and marine terrace sediments is an erosional unconfor-
(1G9r92a)n.t Tetheal.m,ar1i9n9e9)tearrnadceotahterthemeFtlheotdcsher(BJaonniees seitteali.,s moiftay,boiuntte7rpmret(e2d2.a5s')aawbaovvee-csueatlpelvaetlf.oTrmh,eaotvearnlyeilnegvasteido-n
mapped as correlative with the second emergent marine iment consists ofa marine terrace deposit (Qt) that grades
terrace (terrace 2) around the San Joaquin Hills (Grant et from a silty mudstone near the base to a cross-bedded,
al., 1999). moderately well sorted, unconsolidated sand near the top.
Upper Pleistocene marine deposits and assorted inver- A bryozoan biorudite and shell lenses are present in this
tebrate faunas are well known around Newport Bay (see unit between 7.4 m and 9.5 m elevation (24-31'). The
Watts, 1900; Arnold, 1903; Bruff, 1946; Hoskins, 1957; marine terrace sediments (Qt) are overlain and cut into
Kanakoffand Emerson, 1959; Mount, 1981;Peska, 1975, by fluvial channel deposits (unit Qc) consisting ofuncon-
1976, 1984; Powell, 2001). Most of these reports deal solidated silty sand, with associated overbank deposits
with the warm-water fauna from the second terrace (Qob) composed of unconsolidated muddy silt and sand.
Page 184 The Veliger, Vol. 47, No. 3
33°37'30"
33°35'
-iiyss' 117<'52'30"
Figure 1. A. Locality map showing location ofthe eight-acre parcel developed forFletcherJones Motors Cars. This parcel isbounded
on the west by Jamboree Road, on the northeast by the San Joaquin Hills Transportation Coiridor (Highway 73), and on the south by
where Bayview Way would project if it extended past Jamboree Road, north of San Diego Creek (covered), in the city of Newport
Beach near the northeast end ofUpper Newport Bay, and the approximate position ofOCPC localities 2601 through 2606 (Table 1) in
the parcel. B. Shows the general location ofthe Fletcher Jones site in relation to other late Pleistocene fossil localities in the Newport
Bay area (indicated by small pectens). Other fossil localities mentioned in text are named.
—
•
C. L. Powell II et al.. 2004 Page 185
16 _QS_
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Figure 2. Composite stratigraphic section of the—Fletcher Jones site. Abbreviations are; Tn S—ilty mudstone. questionably referred to
the Pliocene "Niguel" Formation (se—e text); Qt marine terrac—e bay deposit. Pleistocene; Qc fluvial channel. Pleistocene?; Qob
overbank deposits. Pleistocene?; Qal alluvium. Holocene; Qs topsoil. Holocene. OCPC locality 2603 includes the entire unit Qt.
OCPC localities 2604 and 2605 referto separate shelly lag deposits within unit Qt. The scale is meters above mean sea level and starts
at the lowest exposure.
Both Qc and Qob are overlain by colluvium and alluvium ofsmaller species not recovered elsewhere. Because most
m
(unit Qal) to an elevation of about 16.5 (54 ft), on ofthe collections were high-graded during collection and
which a soil (unit Qs) has developed. are from the same deposit, we combine all the collections
for paleoenvironmental analysis, although the collections
PALEONTOLOGIC DISCUSSION are listed separately in Table 1.
Ofnote at the Fletcher Jones site are a few particularly
Fauna
large specimens of the venerid bivalves Chione cortezi
A fauna ofat least 103 invertebrate species represented Carpenter to 84.3 mm and C gnidia Broderip & Sowerby
by 98 species of mollusks (54 bivalves, 43 gastropods, to 129.7 mm. The largest specimens here are larger than
and one scaphopod), at least three species of arthropods the maximum size for these species reported by Keen
(crabs and barnacles), and two echinoids were recovered. (1971). A simnmgle broken specimen of Turritella mariana
The species represent a mixed thanatocoenosis derived about 75.5 long compares well with modern speci-
from several nearshore marine habitats. Most of the bi- mens at the California Academy of Sciences. This spec-
valves are represented by single valves, many with at- imen, if correctly identified, is the first fossil record of
tached epibionts, although some specimens were articu- this species.
lated.
Paleoenvironment Reconstruction
With the exception of the bulk sediment sample from
OCPC locality 2601, all collections from the Fletcher Species from four broad habitats are present from the
Jones site are dominated by large, well-preserved, high- Fletcher Jones site: (1) sandy, intertidal to shallow-sub-
graded shells recovered during paleo-salvage operations. tidal, bay; (2) sandy, intertidal to shallow-subtidal. coast;
Most ofthe smaller species obtained are from a bulk sed- (3) rocky, intertidal to shallow-subtidal, coast; and (4)
iment sample (OCPC locality 2601) from the major shell muddy to sandy, deeper subtidal, coast. Molluscan spe-
bed in unit Qt. This sample yielded a significant number cies characteristic ofthe sandy, intertidal to shallow-sub-
• ' '
Page 186 The Veliger, Vol. 47, No. 3
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tidal bays include the bivalve Ostrea conchaphila Car- (>125,000 yr), probably younger than early Pleistocene
penter, which attaches to hard substrates, Donax califor- (<730,000 yr), and was deposited during an interglacial
nica Conrad, and the gastropods Bulla goiddiana Pilsbry, sea-level highstand deposit.
Cerithidea californica Conrad, Criicihulum spinosum Kanakoff and Emerson (1959) described a large fauna
(Sowerby), and Nassarius tegiila (Reeve). These species (n = 427 species of mollusks) nearby along Upper New-
are common in protected bays from the high intertidal port Bay (Natural History Museum ofLos Angeles Coun-
zone [Cerithidea californica] to shallow subtidal water ty, Invertebrate Paleontology [LACMIP] locality 66-2)
depths. Mollusks characteristic of sandy, intertidal to that contains 9.6% extralimital southern species. The per-
shallow subtidal coasts include the bivalvesAiniantis cal- centage of southern extralimital species from LACMIP
losa (Conrad), Donax goiddii Dall, and the gastropods loc. 66-2 is similar to that from the Fletcher Jones site
Conus californicus Reeve, and Olivella spp. Overlapping (12.6%) and both con-espond to the typical 10%-15%
m
depth ranges suggest water depths no deeper than 20 southern extralimital species from deposits attributed to
[Amiantis callosa (Conrad)] and possibly shallower. Mol- substage 5e (G. Kennedy, written communication, 2003).
lusks that represent rock, intertidal to shallow-subtidal In addition, all ofthe species reported here (Table 1), with
coasts include the bivalves Crassadoma gigantea (Gray), the exception of Turitella mariana Dall, have also been
Pseudochama exogyra (Conrad), and the gastropods reported by Kanakoffand Emerson (1959) from LACMIP
Acanthiniicella spirata (Blainville), "Collisella"' scabra loc. 66-2. The similar faunas further supports correlation
(Gould), Astraea iindosa (Wood), Zonaria spadicea ofthe two sites originally suggestedby Grantet al. (1999)
(Swainson), and Tegiila spp. These species are commonly on geomorphic grounds.
found together at intertidal to shallow subtidal water Among the deeper water species in the southern extra-
depths. Lastly, mollusks characteristic ofthe deeperwater limital bivalve Dosinia ponterosa, whose modern depth
depths include the bivalves Dosinia ponderosa (Schu- range is from 50 to 80 m (Bernard, 1983). This occur-
macher), Nuciila exigiia Sowerby, Tellina meropsis Dall, rence indicates warmer water temperatures offshore and
and the scaphopod Dentalium neohexagonum Sharp and not restricted to protected environments as has been sug-
Pilsbry, which together suggest water depths between 10 gested for similar southern extralimital species in the
and 50 m on an open coast. southern California Pleistocene (i.e.. Grant & Gale,
Judging from the abundance of specific taxa and the 1931). Similar faunas showing species from several en-
sediments in which the' fauna was preserved, deposition vironments, including some deeper water, southern extra-
most likely took place in a semi-protected, shallow (<5 limital species, have been recognized at Bixby Slough in
m), sandy environment adjacent to, or within a bay, sim- Torrance, Los Angeles County (Powell, unpublisheddata)
ilar to Outer Newport Bay today. Rocky-shore and deep- and from the second (?) terrace in San Pedro (Chace,
er-water species were probably washed in by storm 1966).
waves. The difference in the elevation of the marine terrace
platform at LACMIP loc. 66-2 [20 m (Kanakoffand Em-
CORRELATION AND AGE erson, 1959)] and the Fletcher Jones site (approx. 7 m)
may be explained by their distance form the original
Dating Quaternary faunas may be difficult because of shorelines, tectonic uplift of the San Joaquin Hills, and/
their modern aspect and similar zoogeographic aspects of or anticlinal folding along a northwest trending fold axis
faunas of different ages. Because all the species in the (Stevenson & Emery, 1958; Grant et al., 1999). The plat-
Fletcher Jones fauna are extant, they probably indicate a form ofterrace 2 slopes away from the San Joaquin Hills
middle to late Pleistocene age. In addition, the Fletcher and approximately toward the Fletcher Jones site (Grant,
Jones site contains 12.6% southern extralimital species, unpublished data) similar to those of other terrace plat-
which indicates correlation with an interglacial sea-level forms in the area (Barrie et al., 1992). If this is because
highstand deposit. Highstand deposits in southern Cali- of the original position of the two sites with respect to
fornia date to 80,000-85,000 yr (oxygen isotope (8 '*<0) the Pleistocene shoreline or tectonic uplift, or both, is
substage 5a), 100.000-105,000 yr (substage 5c), unclear. But in both cases the platform elevation at LAC-
120,000-130,000 yr (substage 5e), 200,000-220,000 yr MIP 66-2 should be higher than at the FletcherJones site.
(stage 7), —320,000 yr (stage 9) and older (Lajoie et al., In addition, late Pleistocene faulting near the head ofUp-
1991; Ponti et al., 1991). Los Angeles Basin highstand per Newport Bay (Grant et al., 2000) may also have dis-
deposits younger than those ofsubstage 5e do not contain placed the teiTace platform and contributed to the differ-
extralimital southern species, but typically contain an el- ence in elevations.
ement ofextralimital northern species indicative of cool- LACMIP loc. 66-2 has been correlated with the Fletch-
er-water paleoclimate conditions that are found today off er Jones site (above) and is approximately 1 km northeast
the adjacent coast (Kennedy et al., 1982; Kennedy, 2000; of, and is probably correlative with, LACMIP loc. 136
Powell et al., 2000). Therefore, the Fletcher Jones fauna and loc. FP-28 of Peska (1984) based on similar faunas
is inferred to be older than or equal to substage 5e andelevations. Grantet al. (1999) report aUraniumseries
Page 190 The Veliger. Vol. 47. No. 3
age of 122,000 yrs for a specimen of the solitary coral bivalves attaining a large size; in particularly Chione cor-
Paracyathus pedroensis from loc. FP-28 (Peska, 1984). rezi to 84.3 mm and C. gnidia to 129.7 mm.
Therefore, the best estimate of the age of the Fletcher The age of the Fletcher Jones fauna can be inferred
Jones fauna is approximately 120,000—125,000 yr, cor- from correlation with that from LACMIP loc. 136. which
relative with marine oxygen isotope (8 "*0) substage 5e. also contains extralimital southern species and is dated to
Powell (2001) described a fauna ("Newport Bay North about 125,000 yr, corresponding with marine oxygen-iso-
1" on Figure IB) along the southern margin of Newport tope (8 "*0) substage 5e.
Mesa across Pacific Coast Highway from the Lido Isle Acknowledgments. We would like to thank Larry A. Beyer.
Reach ofNewport Bay, at about an elevation of7 m. This Lindsey T. Groves and especially George L. Kennedy for their
elevation is nearly identical to the elevation ofthe marine helpful comments, and John D. Cooperforthe loanofspecimens
platform at the Fletcher Jones site (approx. 7 m). How- under his care at the Orange County Paleontological Collections
ever, NewportBay North 1 was assigned to the firstemer- (OCPC).
gent terrace in the San Joaquin Hills by Grant et al.
LITERATURE CITED
(1999), based on its geomorphic position below terrace 2
and the surface of Newport Mesa. In addition, the New-
Arnold. R. 1903. The paleontology and stratigraphy ofthe ma-
port Bay North 1 fauna contains several extralimital rine Pliocene and Pleistocene ofSan Pedro. California. Cal-
northern species (Powell, 2001). The cool-water northern ifornia Academy of Sciences. Memoir 3:420 pp.
extralimital species and geomorphic position suggest cor- Barrie, D., T. S. Tatnall & E. M. Gath. 1992. Neotectonic
relation with highstand deposits younger than substage 5e uplift and ages of Pleistocene marine terraces, San Joaquin
(Kennedy et al., 1982; Kennedy, 2000; Powell, 2001), Hills. Orange County, California. In: The Regressive Pleis-
and younger than the Fletcher Jones fauna. tocene Shoreline, Coastal Southern California. Vol. 20, pp.
115-121. SouthCoastGeological Society.AnnualFieldTrip
The Fletcher Jones fauna is similar to other faunas Guidebook.
from southern California based on the mutual presence Bernard, F. R. 1983. Catalogue of the living Bivalvia of the
of southern extralimital species. Unfortunately, the oc- Eastern Pacific Ocean: Bering StraittoCape Horn.Canadian
currence of extralimital southern species alone does not Special Publications of Fisheries and Aquatic Sciences 6:
allow precise correlation. Warmer-than-present faunas ex- 102 pp.
ist in outcrops correlated to marine oxygen—isotope stages Bruff, S. C. 1946. The paleontology ofthe Pleistocene mollus-
can fauna of the Newport Bay area. California. University
11, 9, possibly 7, and 5e (about 350,000-125,000 yr) of California Publications, Bulletin of the Department of
(Kennedy et al., 1982; Kennedy, 2000; Powell et al., Geological Sciences 27(6):213-240.
2000), and therefore correlation based on the zoogeo- Chace, E. p. 1966. Pleistocene Mollusca fromthe secondterrace
graphic character alone is not precise. But coupled with at San Pedro, California. Transactions ofthe San Diego So-
geomorphic data the Fletcher Jones site is coneiated with ciety ofNatural History 14(13):169-172.
other fossil localities around Upper Newport Bay that are GranEtd,waL.rdBs.,, RK..MJu.nMruoel&lerG.,LE..KMe.nnGeadtyh.,19H9.9.ChLeatneg,QuRa.terL-.
dated to substage 5e (about 125,000 yr).
nary upliftandearthquakepotentialofthe SanJoaquinHills,
southern Los Angeles Basin. California. Geology 27(11):
CONCLUSION 1031-1034.
Grant. L.—B., K. J. Mueller. E. M. Gath & R. Munro. 2000.
A late Pleistocene fauna from the FletcherJones site near Reply Late Quaternary uplift and earthquake potential of
the northeastern end of Upper Newport Bay, Newport the San Joaquin Hills, southern Los Angeles Basin. Califor-
Beach, Orange County, southern California, yielded an Grannti,a.UG.eoS.l,oIgVy &28(H4.):R3.84G.ale. 1931. Catalogue ofthe marine
assemblage of at least 103 species consisting of 98 spe- Pliocene and Pleistocene Mollusca of California and adja-
cies of mollusks, at least three species ofarthropods, and cent regions. San Diego Society ofNatural History Memoir
two echinoids from six spot collections. The composite 1:1036 pp.
fauna represents a mixed thanatocoenosis, with represen- Hoskins, C. W. 1957. Paleontology and correlationofthe lowest
tatives from protectedbay, sandy- and rocky-bottom, pro- emergent California marine terrace, from San Clemente to
tected to open coasts, and offshore environments. The Halfmoon Bay. Unpublished Ph.D. Dissertation, Stanford
University. Stanford, Calif. 188 pp.
fauna includes 12.6% extralimital southern species, indi- Kanakoff, G. p. & W. K. Emerson. 1959. Late Pleistocene in-
cating warmer-water temperatures than present. All ofthe vertebrates of the Newport Bay area. California. Los An-
extralimital southern species are common in shallow geles County Museum, Contributions in Science 31:47 pp.
bays, where warmer water conditions might exist, except Keen, A. M. 1971. Sea Shells ofTropical West America.Marine
the bivalve Dosinia ponderosa. Dosinia ponderosa is re- Mollusks from Baja California to Peru. Stanford University
ported living offshore (Keen, 1971; Bernard, 1983), and Press: Stanford, Calif xiv -I- 1064 pp.
eorc-cwuanteerncceonodfitwieolnls-porfefssehrovreed aslpseo.ciOmefnsintseurgegsetstfsrowmartmh-e KennvLeeedtryttie,sbrG(ae.tdes.L).f.au2Qn0ua0as0.t.erIZnn:oaorJgy.eoSG.reaoNpcohhlirlceorn,coolJro.rgeMyl;.atiMSoeontwhoeofrdsmsa&rainnWde.AipRn-.-
Fletcher Jones fauna is TitniteUa inariana, which is re- plications. AGU Reference Shelf Vol. 4, pp. 413-424.
ported as a fossil for the first time, and a few venerid Kennedy, G. L., K. R. Lajoie & J. E Wehmiller. 1982. Ami-
C. L. Powell II et al., 2004 Page 191
nostratigraphy and faunal correlations of late Quaternary side ofan eight-acre parcel being developed forFletch-
marine terraces. Pacific Coast. USA. Nature 299(5883):545- er Jones Motors Cars, this parcel is bounded on the
LajoiA5e4.,7.MK.. RS.a,rDn.a-JW.oPjocNiTcik,].C.1L9.91P.owEmeelrlgeIIn,tS.maAr.iMneatshtiraensdolnine&s Jwoeasqtuibny HJialmlbsorTreaensRpooardt,atioonntChoerrniodrothrea(sHtigbyhwtahye 7S3a)n,
and associated sediments, coastal California: A record of and on the south by where Bayview Way would project
Quaternary sea-level fluctuations, vertical tectonic move- if it extended past Jamboree Road, north of San Diego
ments, climatic changes, andcoastal processes. Pp. 190-214 Creek (covered), in the city ofNewport Beach nearthe
in R. B. Morrison (ed.). Quaternary Nonglacial Geology: northeast end of Upper Newport Bay, Orange County,
Conterminous U.S. The Geology of North America. Vol. California. Collected by Lisa B. Grant, 14 December
K-2. Geological Society of America: Boulder, Colo.
MortCoonu,ntPy.,KC.al&ifoRr.niVa.,MSihlolewri.ng19M8i1n.eGseoalnodgiMcinmearaploDfeOporsaintgse. OC1P9C95,26f0ie2l.d nSoa.mpLlGe-s95c-o1l2l-e1c4teCd.from coarse sand with
California Division of Mines and Geology Bulletin 204. highly compacted, olive to brown, mottled, mud, rip-
Scale 1:48,000. up clasts at the contact between the "Niguel" Forma-
Mount, J. D. 1981. Check list of late Pleistocene macrofossils tion and overlying Pleistocene deposits. This locality
fromCostaMesa. Orange County, California. Bulletin ofthe is at an elevation of about 22.5' (7 m), and is located
Southern California Paleontological Society 13(l/2):2-5.
Peska, F. 1975. A late Pleistocene molluscan fauna from Costa about 160' (49 m) east ofJamboree Road, north ofthe
Mesa, California: preliminary report. Bulletin of the South- intersection of Jamboree Road and Bayview Way, city
ern California Paleontological Society 7(11):141-145. of Newport Beach near the northeast end of Upper
Peska, E 1976. Late Pleistocene fossils from Upper Newport Newport Bay, Orange County, California. Collected by
Bay, California. Bulletin of the Southern California Pale- S. E. Clay [field no. SEC-FJ-04-10-96-01 (Bed 01)];
ontological Society 8(2):15-21. L. L. Sample, and D. Alexander, 10 April 1996; and R
PeskaBS,atya,EduCm1a9l8i(4fe.odrsn.Li)a.at.eTPhPpel.ei5Nsa5tt-ouc6re0anleinfSocBsi.seilnBscuetflerorof,mJO.UrpaGpnaegnretN&CeowupCn.otryJt.. OCHP.CDo2r6s0e3y. oSnam5plAeusgufsrtom19l9o6cal[fliyelcdrnoos.s-PbHeDd-d8e-d,5-l9o6o-s1e]l.y
Memoirs of the Natural History Foundation of Orange compacted, white to gray, sand bed extending from
County, 1. 22.5' (6.8 m) to 37' (11.2 m) above sea level and con-
PoNTi, D. J. K. R. Lajoie & C. L. PowellII. 1991. Upper Pleis- tains concentrated shells lenses up to 2' (0.6 m) thick.
tocene marine terraces in San Pedro, southwestern Los An- Entire bed generally composed oflocally cross-bedded,
geles Basin, California: implications for aminostratigraphy loosely compacted, white to gray sand. This locality is
and coastal uplift. Geological Society ofAmerica, Abstracts
with Programs 23(2):89. locatedabout 260' (79 in) eastofJamboree Road, north
Powell, C. L., II. 2001. Geologic and molluscan evidence for a ofthe intersection ofJamboree Roadand BayviewWay
previously misunderstood late Pleistocene, cool water, open and slightly northwest of OCPC 2602, city ofNewport
coast terrace at Newport Bay, southern California. The Ve- Beach near the northeast end of Upper Newport Bay,
liger 44(3):332-339. Orange County, California. Collected by L. L. Sample
Powell, C. L., II, K. R. Lajoie & D. Ponti. 2000. A preliminary [field no. LLS-FJ-02-27-96-04 (Bed 04)], S. E. Clay,
chronostratigraphy basedon molluscanbiogeography forthe S. W. Conkling, D. Alexander, G. King, and P H. Dor-
late Quaternary of southern California. Western Society of
Malacologists Annual Report 32:23-36. sey, 25 March 1996; and P Dorsey [field no. PHD-10-
Stevenson, R. E. & K. O. Emery. 1958. Marshlands atNewport 24-96?-5] 24 October 1996.
Bay, California. Allan Hancock Foundation Publications, OCPC 2604. Sainple from massive, loosely compacted,
Occasional Paper, 20. 109 pp. white sand at 31' (9.5 m) elevation about 240' (73 m)
Vedder, J. G., R. E Yerkes & J. E. Schoelhamer. 1957. Geo- east of Jamboree Road, north of the intersection of
logic map of the San Joaquin Hills-San Juan Capistrano Jamboree Road and Bayview Way and slightly north-
aarneda.GOarsanIgnveesCtoiugnattyi,onCsalMiafoprnOiaM.-1U.9S3..GeSoclaloegic1a:2l4,S0u0r0v.eyOil east of OCPC 2603, city of Newport Beach near the
Watts, W. L. 1900. Oil and gas yielding formations ofCalifor- northeast end of Upper Newport Bay, Orange County,
nia. California State Mining Bureau, Bulletin 19. 236 pp. California. Collected by L. L. SamWple [field no. LLS-
FJ-02-27-96-04A (Bed 4A)], S. Conkling, S. E.
APPENDIX—LOCALITY DESCRIPTIONS Clay, and D. Alexander, 27 February 1996.
OCPC 2605. Sample froin fine-grained, loosely compact-
The specimens used in this study are deposited at the ed, white to gray, sand at an elevation of 29.5' (9 m)
Orange County paleontology curation facility (OCPC),
located about 280' (85 m) east ofJamboree Road, north
currently located at 1119 EastChestnut Street, SantaAna, ofthe intersection ofJamboree Road and BayviewWay
California 92701. and east of OCPC 2604, city of Newport Beach near
OCPC 2601. Sample from shelly layer approximately 12' the northeast end of Upper Newport Bay, Orange
(3.7 m) below the top ofthe geomorphic terrace, which County, California. Collected by L. L. Sample [field
may have been disturbed by grading prior to sampling, no. LLS-FJ-02-30-96-4B (Bed 4B)], S. E. Clay, and S.
the shelly sand layer is atan elevation ofapproximately W. Conkling, 30 February 1996.
32-33 feet (—10 m) in a graded cut on the southwest OCPC 2606. Float collected in an eight-acre parcel de-
Page 192 The Veliger, Vol. 47, No. 3
veloped for Fletcher Jones Motors Cars. This parcel is north of San Diego Creek (covered), in the city of
bounded on the west by Jamboree Road, on the north- Newport Beach near the northeast end of Upper New-
east by the San Joaquin Hills Transportation Corridor port Bay, Orange County, California, collected by S.
(Highway 73), and on the south by where Bayview E. Clay [field nos. SEC-FJ-01-29-96-01 and SEC-FJ-
Way would project if it extended past Jamboree Road, 07-08-96-01], L. L. Sample and R H. Dorsey.