USGS M5050, Zayante Creek (Oligocene to of the United States)

Where: Santa Cruz County, California (37.1° N, 122.0° W: paleocoordinates 35.8° N, 114.5° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Vaqueros Sandstone Member (San Lorenzo Formation), Chattian to Chattian (28.1 - 20.4 Ma)

• Above basalt flows with in Vaqueros Sandstone. Vaqueros Sandstone is up to 920 m thick conformably overlies the Rice Mudstone and overlain by the Lambert Shale. Zemorrian (Oligocene) and Saucesian (early Miocene) age.

• bed-level stratigraphic resolution

Environment/lithology: coastal; fine-grained, medium, gray sandstone

• Contains a series of pillow basalt flows.
• Primarily thick-bedded to massive, moderately sorted, slightly granular medium-grained to well-sorted fine-grained, arkosic sandstone. The sandstone is light gray to medium gray when fresh and yellowish gray when weathered.

Size class: macrofossils

Reposited in the UMMP

Collection methods: quarrying,

• Also collections at USGS, Menlo Park

Primary reference: J. C. Clark. 1981. Stratigraphy, paleontology, and geology of the Central Santa Cruz Mountains, California Coast Ranges. United States Geological Survey Professional Paper 1168:1-51 [A. Miller/A. Hendy/R. McClees-Funinan]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 37516: authorized by Austin Hendy, entered by Austin Hendy on 16.03.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Representative for molluscan, echinoid and cirriped taxa; does not include mentioned foraminifera
 Arcida - Glycymerididae
Glycymeris sp. Da Costa 1778 clam
 Pectinida - Pectinoidae
 Mytilida - Mytilidae
"Mytilus cf. expansus" = Crenomytilus expansus
"Mytilus cf. expansus" = Crenomytilus expansus Arnold 1907 mussel
 Carditida - Crassatellidae
Crassatella granti Wiedey 1928 clam
 Cardiida - Veneridae
Chione latilaminosa Anderson and Martin 1914 venus clam
Dosinia margaritana Wiedey 1928 venus clam
 Cardiida - Cardiidae
"Trachycardium vaquerosense" = Trachycardium (Trachycardium) vaquerosensis
"Trachycardium vaquerosense" = Trachycardium (Trachycardium) vaquerosensis Arnold 1908 cockle
 Neogastropoda - Olividae
Oliva sp., "Olivella cf. pedroana" = Olivella (Callianax) pedroana
Oliva sp. Bruguière 1789 olive snail
"Olivella cf. pedroana" = Olivella (Callianax) pedroana Conrad 1856 olive snail
Subspecies: Olivella cf. pedroana var. subpedroana
 Neogastropoda - Buccinidae
Searlesia sp. Harmer 1914 true whelk
 Neogastropoda - Conidae
Conus owenianus Anderson 1905 cone shell
 Calyptraeoidea - Calyptraeidae
 Tonnoidea - Ranellidae
Cymatium sp. n. sp.
Cymatium sp. n. sp. Röding 1798 triton shell
 Sorbeoconcha - Turritellidae
Turritella inezana turret shell
  - Neptuneidae
 Turbinoidea - Turbinidae
"Astraea aff. morani" = Astraea (Pomaulax) morani
"Astraea aff. morani" = Astraea (Pomaulax) morani Loel and Corey 1932 snail