Bollan Quarry, Rabbit Valley (Jurassic to of the United States)

Also known as Bollan Stegosaurus, CO-27, Bollan's Site

Where: Mesa County, Colorado (39.2° N, 109.0° W: paleocoordinates 35.3° N, 55.6° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

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

• low in Brushy Basin Mbr., 25 ft. above the base

• bed-level stratigraphic resolution

Environment/lithology: "channel"; poorly lithified, gray, green sandstone and hematitic, red claystone

• "a soft grayish-green sandstone, but immediately adjacent to the bones, it gave way to a red hematitic clay"

Size class: macrofossils

Preservation: soft parts

Collected by H. Bollan in 1978, 1984, 1986–1987

Collection methods: quarrying, surface (in situ), mechanical,

Primary reference: H. J. Armstrong, W. R. Averett, M. E. Averett, E. S. McReynolds, and D. G. Wolny. 1987. Mid-Mesozoic paleontology of the Rabbit Valley area, western Colorado. In W. R. Averett (ed.), Paleontology and Geology of the Dinosaur Triangle: Guidebook for 1987 Field Trip. Museum of Western Colorado, Grand Junction 37-43 [M. Carrano/M. Carrano]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 56586: authorized by Matthew Carrano, entered by Matthew Carrano on 21.11.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

Reptilia
 Avetheropoda - Allosauridae
Allosaurus sp.2 Marsh 1877 allosaurid
 Ornithischia - Stegosauridae
Stegosaurus ungulatus1 Marsh 1879 ornithischian