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Ghost Ranch Quarry (Triassic of the United States)

Also known as Whitaker Quarry, Coelophysis Quarry

Where: Rio Arriba County, New Mexico (36.3° N, 106.5° W: paleocoordinates 14.8° N, 46.4° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Siltstone Member (Chinle Formation), Rhaetian (205.6 - 201.6 Ma)

• Apachean LVF. Has been placed variously previously in the "upper Petrified Forest Member", in the "siltstone member" of the Chinle Formation, the Owl Rock Member and the Rock Point Member.

• group of beds-level stratigraphic resolution

Environment/lithology: crevasse splay; bioturbated, intraclastic, brown, green, red, muddy siltstone and pebbly, calcareous conglomerate

• "pond [underlying the main quarry layer] represented a topographic depression in which the dinosaurs and associated carcasses accumulated...carcasses were washed into the quarry by a single [flood] event that also ripped up underlying lacustrine siltstones and even introduced some bones into the uppermost level of the lacustrine interval"
• "The quarry itself is in a sequence of 11 siltstone beds...These beds are intensively bioturbated, contain many silt rip-up clasts"; "predominately of reddish-brown, yellowish-brown, and light greenish-grey siltstones interbedded with carbonate pebble conglomerates; 10-20 m of interbedded sandstone and siltstone comprise the top of the section."

Size classes: macrofossils, mesofossils, microfossils

Collected by E. H. Colbert in 1947-1982; reposited in the AMNH, CM, MCZ, YPM

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

• 1947 AMNH expedition under E. H. Colbert

•Material also in MNA, NMMNH, TMP

Primary reference: E. H. Colbert. 1947. The little dinosaurs of Ghost Ranch. Natural History 59(9):392-399-427-428 [A. Behrensmeyer/A. Behrensmeyer/A. Murch] more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 48422: authorized by Matthew Carrano, entered by Matthew Carrano on 18.03.2005, edited by Richard Butler and Bethany Allen

Creative Commons license: CC BY (attribution)