Holt Quarry (Jurassic to of the United States)

Also known as Riggs Hill, Fruita, Holt's Quarry 1, Holt's Quarry 2, CO-46, CO-47

Where: Mesa County, Colorado (39.1° N, 108.6° W: paleocoordinates 35.1° N, 55.3° W)

• coordinate stated in text

• outcrop-level geographic resolution

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

• 116 ft below top of member (48 ft above Riggs Quarry 13)

• bed-level stratigraphic resolution

Environment/lithology: "channel"; sandstone and mudstone

Size class: macrofossils

Collected by Holt & Hansen in 1937

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

Primary reference: E. L. Holt. 1940. The dinosaurs of the Grand River Valley. Journal of the Colorado-Wyoming Academy of Science 2(6):28-29 [M. Carrano/M. Carrano]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 56684: authorized by Matthew Carrano, entered by Matthew Carrano on 22.11.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

Reptilia
 Theropoda -
Allosaurus sp. Marsh 1877 allosauroid
18 caudal vertebrae, 1 scapula, 1 metatarsal, numerous ribs
 Saurischia - Brachiosauridae
? Brachiosaurus sp. Riggs 1903 brachiosaurid
32 caudal vertebrae, 1 tibia, 1 fibula
 Ornithischia - Stegosauridae
Stegosaurus sp. Marsh 1877 ornithischian
31 caudal vertebrae, 4 spines, 2 plates, 1 femur, several ribs