LSJU loc. 2121 [Round Mountain Silt] (Miocene of the United States)

Where: Kern County, California (35.4° N, 118.8° W: paleocoordinates 35.3° N, 113.6° W)

• coordinate stated in text

When: Round Mountain Formation, Langhian (16.0 - 13.8 Ma)

• Stratigraphic horizon: lowermost part of Round Mountain silt. AGE: Changed to Langhian and "Round Mountain Silt" following EPICC stratigraphic revision.

Environment/lithology: marine; poorly lithified, gray siltstone

Size class: macrofossils

Collected by D. B. Birch, R. T. White, L. T. Martin, E. A. Watson, A. M .Keen in 1938 - 1940

• Collectors: Donald C Birch, 1938; Robert T. White, 1939; Lois T. Martin and Elizabeth A. Watson, 1940; A. Myra Keen, 1939.

Primary reference: A. M. Keen. 1943. New mollusks from the Round Mountain Silt (Temblor) Miocene of California. Transactions of the San Diego Society of Natural History 10(2):25-60 [J. Marcot/J. Marcot]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 206393: authorized by Jonathan Marcot, entered by Jonathan Marcot on 14.11.2019

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Gastropoda
 Trochoidea - Trochidae
Calliostoma cf. diabloensis
Calliostoma cf. diabloensis Clark 1915 top snail
 Vanikoroidea - Eulimidae
Eulima gabbiana, Balcis conchita n. sp.
Eulima gabbiana Anderson and Martin 1914 snail
Balcis conchita n. sp. Keen 1943 snail
 Neotaenioglossa - Calyptraeidae
Crepidula rostralis, Calyptraea filosa
Crepidula rostralis Conrad 1865 slipper shell
Calyptraea filosa Gabb 1866 slipper shell
 Cerithioidea - Turritellidae
Turritella ocoyana
Turritella ocoyana Conrad 1855 turret shell
 Epitonioidea - Epitoniidae
Epitonium cf. indianorum, "Ferminoscala whitei n. sp." = Scalina whitei, Ferminoscala durhami n. sp.
Epitonium cf. indianorum Carpenter 1864 wentletrap
"Ferminoscala whitei n. sp." = Scalina whitei Keen 1943 wentletrap
Ferminoscala durhami n. sp. Keen 1943 wentletrap
 Neogastropoda - Olividae
"Olivella ischnon" = Olivella (Olivella) ischnon
"Olivella ischnon" = Olivella (Olivella) ischnon Keen 1943 olive snail
 Neogastropoda - Muricidae
"Trophon kernensis" = Trophon (Austrotrophon) kernensis, Typhis (Talityphis) lampada n. sp.
"Trophon kernensis" = Trophon (Austrotrophon) kernensis Anderson 1905 murex snail
Typhis (Talityphis) lampada n. sp. Keen 1943 murex snail
 Neogastropoda - Buccinidae
Phos (Antillophos) dumbleana, "Amphissa posunculensis" = Antillophos posunculensis
Phos (Antillophos) dumbleana Hanna 1924 true whelk
"Amphissa posunculensis" = Antillophos posunculensis Anderson and Martin 1914 true whelk
 Neogastropoda - Siphonaliidae
Bruclarkia geniculata
 Neogastropoda - Nassariidae
Nassarius arnoldi, Nassarius antiselli, "Nassarius ocoyanus" = Nassarius (Phrontis) ocoyanus, "Nassarius blakei" = Nassarius (Phrontis) ocoyanus
Nassarius arnoldi Anderson 1905 snail
Nassarius antiselli Anderson and Martin 1914 snail
"Nassarius ocoyanus" = Nassarius (Phrontis) ocoyanus Anderson and Martin 1914 snail
"Nassarius blakei" = Nassarius (Phrontis) ocoyanus Anderson and Martin 1914 snail
 Neogastropoda - Columbellidae
Anachis watsonae n. sp., Mitrella (Mitrella) anchuela n. sp.
Anachis watsonae n. sp. Keen 1943 snail
Mitrella (Mitrella) anchuela n. sp. Keen 1943 snail
 Neogastropoda - Cancellariidae
"Cancellaria dalliana" = Cancellaria (Euclia) dalliana, "Cancellaria condoni" = Cancellaria (Euclia) condoni, Cancellaria barkeri, Cancellaria simplex, Cancellaria pacifica, "Cancellaria ramonensis" = Cancellaria oregonensis
"Cancellaria dalliana" = Cancellaria (Euclia) dalliana Anderson 1905 snail
"Cancellaria condoni" = Cancellaria (Euclia) condoni Anderson 1905 snail
Cancellaria simplex Anderson 1905 snail
Cancellaria pacifica Anderson 1905 snail
"Cancellaria ramonensis" = Cancellaria oregonensis Conrad 1865 snail
 Neogastropoda - Turridae
"Moniliopsis electilis n. sp." = Ophiodermella electilis, Megasurcula howei
"Moniliopsis electilis n. sp." = Ophiodermella electilis Keen 1943 turrid
Megasurcula howei Hanna and Hertlein 1938 turrid
 Neogastropoda - Clavatulidae
"Turricula buwaldana" = Turricula bulwaldana, Turricula piercei, Turricula ochsneri
"Turricula buwaldana" = Turricula bulwaldana Anderson and Martin 1914 snail
Turricula piercei Arnold 1909 snail
Turricula ochsneri Anderson and Martin 1914 snail
 Neogastropoda - Conidae
Conus owenianus
Conus owenianus Anderson 1905 cone shell
 Neogastropoda - Mangeliidae
Mangelia kernensis
Mangelia kernensis Anderson and Martin 1914 snail
 Neogastropoda - Terebridae
Hastula gnomon n. sp., "Terebra cooperi" = Terebra (Terebra) cooperi
Hastula gnomon n. sp. Keen 1943 auger snail
"Terebra cooperi" = Terebra (Terebra) cooperi Anderson 1905 auger snail
 Sorbeoconcha - Ficidae
"Ficus (Trophosycon) ocoyana" = Trophosycon ocoyanum
"Ficus (Trophosycon) ocoyana" = Trophosycon ocoyanum Conrad 1855 fig shell
 Sorbeoconcha - Vitrinellidae
"? Teinostoma (Teinostoma) lens n. sp." = Vitrinella (Vitrinellops) lens
"? Teinostoma (Teinostoma) lens n. sp." = Vitrinella (Vitrinellops) lens Keen 1943 snail
 Sorbeoconcha - Naticidae
"Neverita callosa" = Glossaulax reclusiana, Neverita andersoni, Natica posuncula, Sinum scopulosum
"Neverita callosa" = Glossaulax reclusiana Deshayes 1839 moon snail
Neverita andersoni Clark 1918 moon snail
Natica posuncula Hanna and Hertlein 1938 moon snail
Sinum scopulosum Conrad 1849 moon snail
 Opisthobranchia - Bullidae
Bulla cantuaensis
Bulla cantuaensis Anderson and Martin 1914 snail
 Opisthobranchia - Retusidae
Volvulella gluma
Volvulella gluma Keen 1943 snail
 Opisthobranchia - Cylichnidae
Cylichna temblorensis n. sp., ? Cylichna loismartinae n. sp.
Cylichna temblorensis n. sp. Keen 1943 snail
? Cylichna loismartinae n. sp. Keen 1943 snail
 Heterostropha - Pyramidellidae
"Chrysallida rotundomontana n. sp." = Odostomia (Besla) rotundomontana, Turbonilla (Pyrgolampros) mariposa n. sp., "Syrnola scandix n. sp." = Pyramidella (Syrnola) ochsneri, "Pyramidella cooperi" = Pyramidella (Longchaeus) cooperi, Turbonilla (Pyrgiscus) bravoensis n. sp., Odostomia (Evalea) andersoni
"Chrysallida rotundomontana n. sp." = Odostomia (Besla) rotundomontana Keen 1943 snail
Turbonilla (Pyrgolampros) mariposa n. sp. Keen 1943 snail
"Syrnola scandix n. sp." = Pyramidella (Syrnola) ochsneri Anderson and Martin 1914 snail
"Pyramidella cooperi" = Pyramidella (Longchaeus) cooperi Anderson and Martin 1914 snail
Turbonilla (Pyrgiscus) bravoensis n. sp. Keen 1943 snail
Odostomia (Evalea) andersoni Bartsch and Hertlein 1917 Brea owl
 Heterostropha - Acteonidae
"Acteon boulderana" = Acteon boulderanus
"Acteon boulderana" = Acteon boulderanus Etherington 1931 snail
Bivalvia
 Nuculida - Nuculidae
"Nucula (Ennucula) birchi n. sp." = Nucula (Leionucula) birchi
"Nucula (Ennucula) birchi n. sp." = Nucula (Leionucula) birchi Keen 1943 nut clam
 Nuculanida - Nuculanidae
"Nuculana ochsneri" = Nuculana (Saccella) ochsneri
"Nuculana ochsneri" = Nuculana (Saccella) ochsneri Anderson and Martin 1914 pointed nut clam
 Nuculanida - Yoldiidae
"Yoldia temblorensis" = Yoldia (Yoldia) temblorensis, "Yoldia oregona" = Yoldia (Kalayoldia) oregona
"Yoldia temblorensis" = Yoldia (Yoldia) temblorensis Anderson and Martin 1914 clam
"Yoldia oregona" = Yoldia (Kalayoldia) oregona Shumard 1858 clam
 Lucinida - Lucinidae
"Miltha sanctaecrucis" = Miltha (Miltha) sanctaecrucis, "Lucinisca menuda n. sp." = Lucina (Lucinisca) menuda
"Miltha sanctaecrucis" = Miltha (Miltha) sanctaecrucis Arnold 1909 clam
"Lucinisca menuda n. sp." = Lucina (Lucinisca) menuda Keen 1943 clam
 Pandorida - Pandoridae
Pandora (Kennerlyia) acutirostrata
 Cardiida - Veneridae
Chione (Chione) temblorensis, "Chione (Lirophora) latilaminosa" = Chione (Anomalocardia) latilaminosa, Dosinia (Dosinidia) margaritana, Transennella joaquinensis
Chione (Chione) temblorensis Anderson 1905 venus clam
"Chione (Lirophora) latilaminosa" = Chione (Anomalocardia) latilaminosa Anderson and Martin 1914 venus clam
Dosinia (Dosinidia) margaritana Wiedey 1928 venus clam
Transennella joaquinensis Anderson and Martin 1914 venus clam
 Cardiida - Mactridae
"Mactra sectoris" = Mactromeris sectoris
"Mactra sectoris" = Mactromeris sectoris Anderson and Martin 1914 clam
 Cardiida - Ungulinidae
"Taras buwaldana" = Diplodonta (Diplodonta) buwaldana
"Taras buwaldana" = Diplodonta (Diplodonta) buwaldana Anderson and Martin 1914 clam
 Cardiida - Tellinidae
"Tellina cf. arctata" = Macoma (Psammacoma) arctata, Macoma (Rexithaerus) copelandi, Tellina wilsoni, "Tellina (Peronidia) oldroydi" = Tellina (Eurytellina) oldroydi, Tellina (Arcopagia) ocoyana
"Tellina cf. arctata" = Macoma (Psammacoma) arctata Conrad 1849 tellin clam
Macoma (Rexithaerus) copelandi Wiedey 1928 tellin clam
Tellina wilsoni Anderson and Martin 1914 tellin clam
"Tellina (Peronidia) oldroydi" = Tellina (Eurytellina) oldroydi Wiedey 1928 tellin clam
Tellina (Arcopagia) ocoyana Conrad 1855 tellin clam
 Cardiida - Donacidae
Donax sp., "Bornia (Temblornia) triangulata" = Donax triangulata
Donax sp. Linnaeus 1758 clam
"Donax n. sp"
"Bornia (Temblornia) triangulata" = Donax triangulata Anderson and Martin 1914 clam
 Arcida - Arcidae
Anadara osmonti
Anadara osmonti Dall 1909 ark
 Pectinida - Pectinoidae
"Aequipecten andersoni" = Pacipecten andersoni
"Aequipecten andersoni" = Pacipecten andersoni Arnold 1906 scallop
as Aequipecten andersoni barkerianus ?
Scaphopoda
 Dentaliida - Dentaliidae
"Dentalium conradi" = Dentalium pseudonyma, "Dentalium petricola" = Dentalium pseudonyma
"Dentalium conradi" = Dentalium pseudonyma Pilsbry and Sharp 1898 tusk shell
"Dentalium petricola" = Dentalium pseudonyma Pilsbry and Sharp 1898 tusk shell