UCMP V3531, Corral Hollow Creek (Jurassic to of the United States)

Where: San Joaquin County, California (37.7° N, 121.5° W: paleocoordinates 33.7° N, 67.6° W)

• coordinate based on nearby landmark

• hand sample-level geographic resolution

When: Pliensbachian to Pliensbachian (190.8 - 93.9 Ma)

• reworked chert cobble found in "loose gravel in which the specimen was found was presumably derived from the early Pleistocene Tulare formation." Age range of Franciscan cherts in the Marin Headlands spans the Pliensbachian through Cenomanian.

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified, red chert

• "Dr. N. L. Taliaferro, who reports that the rock is: a red radiolarian chert identical with those so common in the Franciscan. This particular chert is identical with the cherts in the Franciscan [within five or six miles of the locality of occurrence]... many thin sections of which I have examined. The Radiolaria and the chert itself are completely recrystallized to a fine granular mosaic of quartz.... Minute granules and needles of zoisite and epidote are fairly abundant, . . . probably representing the recrystallization of small amounts of impurities originally present. The recrystallization shown by this chert could have been caused by deep burial under a thick prism of sediments such as actually accumulated in that particular region, or from heat developed from a nearby intrusive such as the ordinary serpentine or basalts of the Franciscan."

Size class: macrofossils

Collected by Neal Johnstone Smith in 1935

Collection methods: surface (float)

Primary reference: C. L. Camp. 1942. Ichthyosaur rostra from central California. Journal of Paleontology 16(3):362-371 [M. Carrano/H. Street]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 102282: authorized by Matthew Carrano, entered by Hallie Street on 12.01.2011

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Reptilia
 Ichthyosauria - Ichthyosauridae
Ichthyosaurus franciscanus n. sp.
Ichthyosaurus franciscanus n. sp. Camp 1942 ichthyosaur