Howe Quarry (Jurassic of the United States)

Also known as WY-62, Red Gulch Quarry, Question Mark Quarry, Keyhole Canyon

Where: Big Horn County, Wyoming (44.5° N, 107.8° W: paleocoordinates 39.7° N, 52.3° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Brushy Basin Member (Morrison Formation), Kimmeridgian (157.3 - 152.1 Ma)

• bed-level stratigraphic resolution

Environment/lithology: levee; lenticular, fine-grained, gray, argillaceous, silty mudstone

• levee environment in a poorly drained floodplain
• drab mudstone, dominant clay, some silt, gray with varied tints

Size class: macrofossils

Preservation: mold/impression, soft parts

Collected by B. Brown, W. Sinclair, P. Kaisen, R. Bird in 1932–1934; reposited in the AMNH

Collection methods: quarrying, mechanical,

• density = 14.8; gastroliths present

Primary reference: B. Brown. 1934. How dinosaurs died 125,000,000 years ago. Science News Letter 26(694):51-52 [M. Carrano/M. Carrano]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 46460: authorized by Matthew Carrano, entered by Matthew Carrano on 13.01.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

Reptilia
 Saurischia - Diplodocidae
Diplodocinae indet.4 diplodocine
Diplodocus or Barosaurus
Barosaurus sp.2 Marsh 1890 diplodocine
Apatosaurus sp.3 Marsh 1877 diplodocid
 Saurischia - Camarasauridae
"Morosaurus sp." = Camarasaurus2
"Morosaurus sp." = Camarasaurus2 Cope 1877 camarasaurid
 Saurischia -
Theropoda indet.2 theropod
teeth, "a similar, but smaller, flesh-eating dinosaur"
 Avetheropoda - Allosauridae
Allosaurus sp.1 Marsh 1877 allosaurid
 Neornithischia -
Camptosaurus sp.2 Marsh 1885 bird foot dinosaur