Hoots Locality 41, Santa Monica Mountains (Cretaceous of the United States)

Where: Los Angeles County, California (34.1° N, 118.6° W: paleocoordinates 38.6° N, 85.4° W)

• coordinate estimated from map

When: Tuna Canyon Formation, Late/Upper Cretaceous (100.5 - 66.0 Ma)

• In Hoots as "Chico formation"

Environment/lithology: coastal; shale and brown, green, sandy conglomerate

• The upper member, although containing considerable sandstone and shale and some limestone, is composed of hard massive brown conglomerate to the extent of about 75 per cent. This conglomerate presents a compact mass of rounded cobbles which average from 3 to 5 inches in diameter, en1bedded in a matrix of clean micaceous sandstone having a marked greenish-brown tinge. This matrix is one of the most distinctive characteristics of much of the conglomerate of the Chico and is in striking contrast to the light-gray- arkosic matrix common to conglomerates of Miocene age. This upper Chico conglomerate, although compact and well indurated is only fairly resistant to erosive agencies and commonly weathers to rounded slopes of reddish-brown color.

Size class: macrofossils

Collected by H. W. Hoots, W. P. Woodring; reposited in the CIT, LACM

Primary reference: H. W. Hoots. 1931. Geology of the eastern part of the Santa Monica Mountains, Los Angeles County, California. United States Geological Survey Professional Paper 165(C):83-134 [J. Marcot/J. Marcot]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 237455: authorized by Jonathan Marcot, entered by Jonathan Marcot on 10.12.2024

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Bivalvia
 Arcida - Parallelodontidae
"Parallelodon brewerianus" = Nanonavis breweriana
"Parallelodon brewerianus" = Nanonavis breweriana Gabb 1864 clam