Flag Ridge tracksite (Jurassic to of the United States)

Where: Rio Blanco County, Colorado (39.9° N, 107.9° W: paleocoordinates 26.7° N, 45.5° W)

• coordinate stated in text

• outcrop-level geographic resolution

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

• formation-level stratigraphic resolution

Environment/lithology: eolian; lithified, fine-grained, medium, brown, calcareous sandstone

• "resistant flaggy sandstone...The sandstone is hard, fairly resistant, medium- to fine-grained, usually light-brown to buff in color, with long sweeping foresets that tend to dip southward...The cement is dominantly calcareous..."

Size class: macrofossils

Preservation: cast, trace

Collection methods: surface (float), surface (in situ),

Primary reference: H. Faul and W. A. Roberts. 1951. New fossil footprints from the Navajo(?) sandstone of Colorado. Journal of Paleontology 25(3):266-274 [M. Carrano/M. Carrano]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 139584: authorized by Matthew Carrano, entered by Matthew Carrano on 14.02.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

 Scorpionida -
Scorpionida indet. scorpion
USNM 18411, 18415B
Gastropoda indet. Cuvier 1797 snail
trail associated with USNM 18416
? Reptilia "indet. B" Laurenti 1768 reptile
USNM 18409, 18401; quadruped
? Reptilia "indet. C" Laurenti 1768 reptile
USNM 18402, 18412A, 18412B; quadruped
? Reptilia "indet. D" Laurenti 1768 reptile
USNM 18413B, 18410, 18414A; semi-biped
? Reptilia "indet. E" Laurenti 1768 reptile
USNM 18404, 18405; biped
 Ichnofossils -
Octopodichnus sp. Gilmore 1927
USNM 18415A, 18417, 18414B