Also known as Johnson farm, SGDS, MTL, DSQ1, DSQ2, Dinosaur Swim Quarry 1, 2

Where: Washington County, Utah (37.1° N, 113.5° W: paleocoordinates 17.3° N, 52.8° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Whitmore Point Member (Moenave Formation), Hettangian (201.3 - 199.3 Ma)

• among the lowest of the 25 regional track-bearing layers, just below the Top Surface; 53 m above base of formation

•

•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.

•

•Lucas et al. (2011) noted that the St George tracksite is of latest Triassic age, rather than earliest Jurassic as initially reported

• bed-level stratigraphic resolution

Environment/lithology: lacustrine; fine-grained sandstone and mudstone

Size class: macrofossils

Preservation: cast, mold/impression, trace

Collected by S. Johnson, A. Milner in 2000-

Collection methods: quarrying, surface (in situ),

• discovered by Sheldon Johnson

Primary reference: M. Hayden. 2000. Important dinosaur track discovery in St. George. Utah Geological Survey Notes 32(3):9 [M. Carrano/M. Carrano]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 56131: authorized by Matthew Carrano, entered by Matthew Carrano on 11.11.2005

Creative Commons license: CC BY (attribution)