Bloomfield Quarry (Miocene to of the United States)

Also known as CAS 54135, CAS 54126, CAS 57867

Where: Sonoma County, California (38.3° N, 122.8° W: paleocoordinates 38.2° N, 120.4° W)

• coordinate estimated from map

When: Wilson Grove Formation, Tortonian to Tortonian (11.6 - 2.6 Ma)

• The data presented above indicate that the lower part (below the Roblar tuff) of the Wilson Grove Formation is late Miocene in age, between <9.27±0.06 Ma and >6.203±0.011 Ma, whereas in its upper part (above the Roblar tuff) an age range between 6.203±0.011 Ma to possibly as young as

•>2.6 Ma (late Pliocene; Powell and others, 2004) is deter- mined. This age range includes the “Jacalitos” CPMS for the lower unit to possibly the “San Joaquin” CPMS for the upper unit and overall overlaps the upper part of the Tortonian and lower part of the Messinian to the Piacenzian stages of the International Chronostratigraphic Chart (International Com- mission on Stratigraphy, 2012).

Environment/lithology: shallow subtidal; medium-grained, calcareous sandstone

• rocky intertidal or shallow subtidal environment exposed to moderate to heavy surf.
• The Wilson Grove section above the Franciscan Complex begins with a 0.3- to 0.6-m-thick basal conglomerate containing abundant sand with pebble-to cobble-size clasts of the Franciscan Complex rock and abundant disarticulated fossil shell fragments in an upward fining, gritty sandstone, which pinches out to the south. The basal conglomerate is conformably overlain by about 5 m of less fossiliferous, massive-bedded, friable to locally calcite- cemented, fine- to medium-grained, very well-sorted, sandstone. The aforementioned outcrop at the quarry is capped by about a meter of soil.

Size class: macrofossils

Primary reference: N. A. Smith, R. W. Boessenecker, D. Long and C. Powell. 2017. A new marine vertebrate assemblage from the Wilson Grove Formation at Bloomfield Quarry (Late Miocene), Sonoma County, California. Society of Vertebrate Paleontology Program and Abstracts 2017:195-196 [M. Uhen/M. Uhen/M. Uhen]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 188305: authorized by Mark Uhen, entered by Mark Uhen on 28.08.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Malacostraca
 Decapoda - Cancridae
Cancer sp. Linnaeus 1758 lobster
Maxillopoda
 Sessilia - Balanidae
? Balanus sp. Da Costa 1778 barnacle
Balanus aff. nubilus Darwin 1854 barnacle
Bivalvia
 Arcida - Arcidae
 Pectinida - Pectinoidae
Patinopecten sp. Dall 1898 scallop
Chlamys sp. Röding 1798 scallop
Chlamys cf. hodgei Hertlein 1925 scallop
"Chlamys cf. hastata" = Chlamys (Chlamys) hastata Sowerby 1842 scallop
Chlamys aff. egregius Nomland 1917 scallop
Swiftopecten parmeleei Dall 1898 scallop
 Pectinida - Anomiidae
"Anomia peruviana" = Anomia (Anomia) peruviana d'Orbigny 1846 jingle
Pododesmus cf. macrochisma Deshayes 1839 scallop
 Mytilida - Mytilidae
Mytilidae indet. Rafinesque 1815 mussel
Crenomytilus cf. coalingensis Arnold 1909 mussel
Modiolus sp. Lamarck 1801 mussel
 Pholadida - Myidae
Cryptomya californica Conrad 1837 softshell clam
 Pholadida - Teredinidae
Teredo sp. Linnaeus 1758 clam
 Cardiida - Mactridae
Mactridae indet. Lamarck 1809 clam
Tresus pajaroanus Conrad 1857 clam
 Cardiida - Tellinidae
Tellina sp. Linnaeus 1758 tellin clam
Macoma sp. Leach 1819 tellin clam
"Macoma aff. indentata" = Macoma (Rexithaerus) indentata Carpenter 1864 tellin clam
 Cardiida - Cardiidae
Cardiidae indet. Lamarck 1809 cockle
? Clinocardium sp. Keen 1936 cockle
 Hiatellida - Hiatellidae
Panopea abrupta Conrad 1849 clam
 Solenida - Solenidae
Solen sp. Linnaeus 1758 clam
 Solenida - Pharidae
Ensis sp. Schumacher 1817 clam
? Siliqua sp. Mühlfeld 1811 clam
 Lucinida - Lucinidae
Lucinoma annulatum Reeve 1850 clam
 Protobranchia - Yoldiidae
Yoldia sp. Möller 1842 clam
Gastropoda
  - Siphonaliidae
? Lirabuccinum sp. Vermej 1991 snail
 Neogastropoda - Nassariidae
Nassariidae indet. Iredale 1916 snail
Caesia grammatus Dall 1917 snail
 Neogastropoda - Muricidae
Nucella cf. etchegoinensis murex snail
n. sp.
? Nucella sp. murex snail
 Naticoidea - Naticidae
Naticidae indet. Guilding 1834 moon snail
 Calyptraeoidea - Calyptraeidae
Crepidula sp. Lamarck 1799 slipper shell
Crepidula princeps Conrad 1855 slipper shell
 Neritoidea - Neritidae
Neritidae indet. Rafinesque 1815 snail
 Trochoidea - Trochidae
Trochidae indet. Rafinesque 1815 top snail
Chondrichthyes
 Myliobatiformes - Myliobatidae
 Lamniformes - Cetorhinidae
Cetorhinus maximus Gunner 1765 basking shark
 Lamniformes - Lamnidae
"Isurus oxyrhynchus" = Isurus oxyrinchus
"Isurus oxyrhynchus" = Isurus oxyrinchus Rafinesque 1810 mako shark
 Hexanchiformes - Hexanchidae
Hexanchus griseus sixgill shark
Actinopteri
 Salmoniformes - Salmonidae
Oncorhynchus sp. Suckley 1860 Pacific salmon
 Acanthomorphata - Embiotocidae
 Pleuronectiformes - Paralichthyidae
Paralichthys sp. Girard 1858 flatfish
 Scombriformes - Scombridae
Sarda sp. Lacépède 1802
 Perciformes - Sebastidae
Sebastes sp. Cuvier 1829 perch-like fish
 Acanthomorphata - Polyprionidae
Stereolepis sp. Ayres 1859
 Gadiformes - Merlucciidae
Merluccius sp. Rafinesque 1810
 Clupeiformes -
Sardinops sp. Hubbs 1929
Aves
  -
Aves indet. Linnaeus 1758 bird
 Charadriiformes - Panalcidae
Panalcidae indet. Smith 2011 shorebird
Mancallinae indet. Miller 1946 auk
cf. Uria brodkorbi Howard 1981 auk
Mammalia
 Carnivora - Odobenidae
cf. Pontolis sp. True 1905 walrus
Dusignathinae indet. Mitchell 1968 walrus
cf. Imagotaria sp. Mitchell 1968 walrus
Dusignathus santacruzensis Kellogg 1927 walrus
Odobeninae indet. Allen 1880 walrus
Gomphotaria pugnax Barnes and Raschke 1991 walrus
 Cetacea - Balaenopteridae
Balaenopteridae indet. Gray 1864 rorqual
 Cetacea - Cetotheriidae
Herpetocetinae indet. Steeman 2007 whale
 Cetacea -
Odontoceti indet. Flower 1867 toothed whale