Also known as Tuba City, MNA 333, Site 1

Where: Coconino County, Arizona (36.1° N, 111.3° W: paleocoordinates 16.5° N, 50.9° W)

• coordinate based on unpublished field data

• outcrop-level geographic resolution

When: Springdale Sandstone Member (Kayenta Formation), Early/Lower Hettangian (201.3 - 196.5 Ma)

• 31 m (95 ft) above contact with Moenave Fm. and 45 ft below Dilophosaurus skeletons near Tuba City. Orig. assigned to lower Kayenta Fm.

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•Most of the Moenave Formation is the Dinosaur Canyon Member. In the Moenave type section, near Tuba City, Arizona, all of the Moenave section is Dinosaur Canyon Member, as it is throughout the Moenave outcrop belt along the Echo Cliffs and Ward's Terrace of northern Arizona. However, north of the Grand Canyon in Arizona and in southwestern Utah, the upper part of the Moenave Formation is lacustrine strata. These strata are the Whitmore Point Member.

•Lucas et al. (2011: Palaeo3 302: 194-205) proposed, on the basis of multiple lines of biostratigraphic evidence, that the Triassic–Jurassic boundary is placed within the middle part of the Whitmore Point Member of the Moenave Formation where this member is present, and high in the Dinosaur Canyon Member elsewhere. The "Whitmore Point assemblage" of vertebrate taxa, earliest Jurassic (Hettangian) in age. The underlying "Dinosaur Canyon assemblage", is latest Triassic (Rhaetian) in age.

•

•Because the stratigraphic position of this site within the Moenave is unclear, a Rhaetian–Hettangian age is given.

•Reassigned to Springdale Member in Lucas & Tanner 2006.

• bed-level stratigraphic resolution

Environment/lithology: terrestrial; shale and sandstone

Size class: macrofossils

Preservation: mold/impression, trace

Collected by S. Welles in 1967; reposited in the UCMP

Collection methods: surface (in situ), peel or thin section,

Primary reference: A. A. Baker, C. H. Dane, and J. B. Reeside. 1936. Correlation of the Jurassic formations of parts of Utah, Arizona, New Mexico and Colorado. United States Department of the Interior Geological Survey Professional Paper 183:1-66 [M. Carrano/M. Carrano/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 51897: authorized by Matthew Carrano, entered by Matthew Carrano on 30.06.2005

Creative Commons license: CC BY (attribution)