Felton (M5155/M5086) (Miocene of the United States)

Also known as USGS M5155/M5086

Where: Santa Cruz County, California (37.0° N, 122.1° W: paleocoordinates 36.3° N, 118.0° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: San Margarita Formation, Serravallian (13.8 - 11.6 Ma)

• Reaches a maximum thickness of 130 m; unconformably overlies granitic basement, Locatelli, and Monterey Formation; conformably overlain by Santa Cruz Mudstone

• bed-level stratigraphic resolution

Environment/lithology: coastal; unlithified, gray, white, yellow sandstone

• Upper Miocene to Pliocene sedimentary sequence consisting of shallow water transgressive sandstone (Santa Margarita Sandstone), and the deep water siliceous organic mudstone unit (Santa Cruz Mudstone) and a shallow water unit (Purisima Fm)
• Very thick bedded and thickly crossbedded yellowish-gray to white with friable arkosic sandstone

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 37542: 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
 Sessilia - Balanidae
Balanus sp. Da Costa 1778 barnacle
 Lingulida - Disciniidae
 Pectinida - Pectinoidae
"Lyropecten estrellanus" = Nodipecten estrellanus, ? Patinopecten healeyi
"Lyropecten estrellanus" = Nodipecten estrellanus Conrad 1856 scallop
? Patinopecten healeyi Arnold 1906 scallop
 Neogastropoda - Muricidae
Nucella sp. murex snail
Nucella lima murex snail
 Cidaroida -
Cidaroida indet. Claus 1880 pencil urchin
 Clypeasteroida - Echinarachniidae
Astrodapsis cf. arnoldi Clark and Twitchell 1915 sand dollar
"Astrodapsis spatiosus" = Astrodapsis arnoldi spatiosus Kew 1920 sand dollar