Keet Seel, Segi Canyon (UCMP V3308) (Jurassic to of the United States)

Also known as Segisaurus type, UCMP V338, Camp

Where: Coconino County, Arizona (36.8° N, 110.5° W: paleocoordinates 23.9° N, 48.3° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Navajo Sandstone Formation (Glen Canyon Group), Pliensbachian to Pliensbachian (190.8 - 174.1 Ma)

• fossil found 500 feet above the base of the Navajo Sandstone, measured from the top of the underlying Wingate Sandstone, "and 100 feet below its upper level as exposed on the plateau of Skeleton (Zilh-nez') Mesa"

•

•Navajo Sandstone forms uppermost part of Glen Canyon Group, and is Early Jurassic, but probably not older than Pliensbachian (Irmis 2005. A review of the vertebrate fauna of the Lower Jurassic Navajo Sandstone in Arizona. Mesa Southwest Museum Bulletin 11:55–71)

• bed-level stratigraphic resolution

Environment/lithology: dune; lithified, hematitic, red, yellow, calcareous sandstone and poorly lithified, red shale

• Navajo Sandstone is a homogenous, friable, fine-grained, aeolian sediment almost exclusively quartzose and with a calcareous cement. The constituent sand grains, though somewhat angular, are frosted and pitted and in most cases are covered with a thin film of iron oxide which imparts a brick red color to the rock. In some places [it] is poor or entirely lacking in iron oxide, resulting in a buff to nearly white aspect...the aeolian origin...is best shown by the type of cross-bedding of the sediments. At the point where the fossil occurred this cross-bedding is exposed in the long sweeping curves of the fore-set beds, sharply truncated above and set together like wedges at various angles." There is also a fine-grained, carbonaceous, supposedly freshwater limestone lens above the specimen. The shale appears as "soft lumps" that increase in frequency in the layers above the specimen and below the limestone.

Size class: macrofossils

Collected by R. H. Thomas & M. Littlesalt in 1933; reposited in the UCMP

Collection methods: quarrying, mechanical,

• Collected during the 1933 Rainbow Bridge-Monument Valley Expedition, led by A. Hall, VanderHoof & Camp. Discovered by student Robert H. Thomas and Navajo Max Littlesalt.

Primary reference: Anonymous. 1933. Bones of a bird-like dinosaur. Science 78 (supp.)(2033):6-7 [M. Carrano/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 25306: authorized by Matthew Carrano, entered by Matthew Carrano on 07.09.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Reptilia
 Theropoda - Coelophysidae
Segisaurus halli n. gen. n. sp.
Segisaurus halli n. gen. n. sp. Camp 1936 coelophysoid