Lakes Quarry 5, Morrison (YPM) (Jurassic to of the United States)

Also known as Beckwith Quarry, Dinosaur Ridge

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

• coordinate stated in text

• small collection-level geographic resolution

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

• upper middle part of formation

• bed-level stratigraphic resolution

Environment/lithology: "channel"; lenticular, red, yellow sandstone

• "yellowish to orange quartzitic sandstone"

Size class: macrofossils

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

Collection methods: quarrying, mechanical,

Primary reference: O. C. Marsh. 1877. A new order of extinct Reptilia (Stegosauria) from the Jurassic of the Rocky Mountains. American Journal of Science and Arts 14:513-514 [M. Carrano/M. Carrano/M. Carrano]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 28382: authorized by Matthew Carrano, entered by Matthew Carrano on 10.02.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

 Dipnoi - Ceratodontidae
Ceratodontidae indet.1 Gill 1872 lungfish
 Testudinata - Helochelydridae
"Solemydidae indet." = Helochelydridae1
"Solemydidae indet." = Helochelydridae1 Nopcsa 1928 turtle
 Saurischia -
Diplodocus lacustris n. sp.3 Marsh 1884 sauropod
YPM 1922
 Saurischia - Diplodocidae
Diplodocidae indet.2 diplodocid
limb bones
 Avetheropoda - Allosauridae
Allosaurus sp.2 Marsh 1877 allosaurid
tibia, 2 teeth
 Ornithischia -
Stegosauria indet.4 Marsh 1877 ornithischian
MNHN-1010/CU 189.11, track
 Ornithischia - Stegosauridae
Stegosaurus armatus n. gen. n. sp.
Stegosaurus armatus n. gen. n. sp. Marsh 1877 ornithischian
YPM 1850; "Saurian 5"
 Crocodylia -
"Diplosaurus felise" = Diplosaurus felix1
"Diplosaurus felise" = Diplosaurus felix1 Marsh 1877 crocodilian
YPM 517