Lakes Quarry 10, Morrison (YPM) (Jurassic to of the United States)

Also known as A. laticollis type, Dinosaur Ridge

Where: Jefferson County, Colorado (39.7° N, 105.2° W: paleocoordinates 35.1° N, 52.0° W)

• coordinate estimated from map

• small collection-level geographic resolution

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

• two layers; upper middle part of formation

• group of beds-level stratigraphic resolution

Environment/lithology: "channel"; black mudstone and yellow sandstone

• channel deposit in a poorly drained floodplain environment; fossils from both layers
• black mudstone and buff sandstone beds

Size class: macrofossils

Collected by A. Lakes in 1877-1903; reposited in the YPM

Collection methods: quarrying, mechanical,

Primary reference: O. C. Marsh. 1877. Notice of new dinosaurian reptiles from the Jurassic formation. American Journal of Science and Arts 14:514-516 [M. Carrano/M. Carrano/M. Carrano]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 13341: authorized by Matthew Carrano, entered by Matthew Carrano on 28.02.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

 Testudines -
"Chelonia indet." = Testudines3
"Chelonia indet." = Testudines3 Batsch 1788 turtle
 Saurischia - Diplodocidae
Apatosaurus ajax n. gen. n. sp., "Apatosaurus laticollis n. sp." = Apatosaurus louisae2, Atlantosaurus immanis n. sp.1
Apatosaurus ajax n. gen. n. sp. Marsh 1877 diplodocid
YPM 1860
"Apatosaurus laticollis n. sp." = Apatosaurus louisae2 Holland 1915 diplodocid
YPM 1861
Atlantosaurus immanis n. sp.1 Marsh 1878 diplodocid
YPM 1840; supposedly found with gastroliths
 Avetheropoda - Allosauridae
Allosaurus sp.3 Marsh 1877 allosaurid