Felton (Scotts Valley - Santa Cruz Mudstone) (Miocene of the United States)

Also known as Santa Cruz Mudstone - Scotts Valley, Felton, Santa Cruz

Where: Santa Cruz County, California (37.0° N, 122.0° W: paleocoordinates 36.6° N, 119.5° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Santa Cruz Mudstone Formation, Late/Upper Miocene (11.6 - 5.3 Ma)

• Around 140 m thick at type section, but more than 2,700 m thick in core holes; overlain by Purisima Formation, conformable above the Santa Margarita Sandstone.

• bed-level stratigraphic resolution

Environment/lithology: offshore; poorly lithified, concretionary, dolomitic, brown, yellow, sandy mudstone

• 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)
• Medium- to thick-bedded and faintly laminated pale yellowish-brown siliceous mudstone with scattered spheroidal dolomite concretions; locally grades into sandy siltstone.

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 37547: 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
Bivalvia
 Lucinida - Lucinidae
"Lucinoma cf. annulata" = Lucinoma annulatum
"Lucinoma cf. annulata" = Lucinoma annulatum Reeve 1850 clam
 Protobranchia - Yoldiidae
Yoldia sp. Möller 1842 clam
Ophiuroidea
 Ophiurida - Amphiuridae
Echinoidea
 Spatangoida - Asterostomatidae
Megapetalus sp. Clark 1929 heart urchin