Riggs Quarry 13, Fruita (FMNH) (Jurassic to of the United States)

Also known as Riggs Hill, CO-45

Where: Mesa County, Colorado (39.1° N, 108.7° W: paleocoordinates 35.1° N, 55.3° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Brushy Basin Member (Morrison Formation), Kimmeridgian to Kimmeridgian (157.3 - 145.0 Ma)

• 164 ft below top of member

• bed-level stratigraphic resolution

Environment/lithology: "channel"; green siltstone and sandstone

• "variegated clays...alternation between green and purplish bands does not mark andy variation in the nature of hardness of these massive joint clays. There are frequent layers of clay nodules, sometimes calcareous, and a few ledges of nodular gray sandstone which are confined to limited areas. Occasional thick ledges of cross-bedded sandstone and lenticular masses of greenish sand occur at almost all levels, but these are likewise of limited extent. Near the top...the clays take on a more sandy nature." (Riggs 1901)

Size class: macrofossils

Collected by H. W. Menke, E. Riggs in 1900; reposited in the FMNH

Collection methods: quarrying, mechanical,

• discovered by H. W. Mencke on July 4, 1900

Primary reference: E. S. Riggs. 1901. The dinosaur beds of the Grand River Valley of Colorado. Field Columbian Museum Geological Series 1(9):267-274 [M. Carrano/M. Carrano/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 56683: authorized by Matthew Carrano, entered by Matthew Carrano on 22.11.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

 Saurischia - Brachiosauridae
Brachiosaurus altithorax n. gen. n. sp.
Brachiosaurus altithorax n. gen. n. sp. Riggs 1903 brachiosaurid
FMNH P25107