Also known as Dawn of the Dinosaurs, PEFO 85025, UCMP V7038, MNA 302/8, SMU 228, Camp Butte N1

Where: Apache County, Arizona (34.9° N, 109.8° W: paleocoordinates 10.6° N, 48.3° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Blue Mesa Member (Chinle Formation), Norian (228.0 - 208.5 Ma)

• "stratigraphically several meters lower than PFV 121"; Parker & Irmis (2005: fig. 8) show this high in the Blue Mesa Member. Upper Blue MEsa Mbr. is dated at 220.1 Ma.

•Irmis et al. 2011: The SMC date of 218.1 ± 0.7 Ma (Fig. 2) indicates that the uppermost Blue Mesa Member of the Chinle Formation and overlying strata are mid-Norian or younger in age based on the most recent Late Triassic timescale (Furin et al., 2006; Mundil et al., 2010; Muttoni et al., 2004, 2010).

•Kent et al. 2019: Magnetozones PF5r to PF10n in the underlying 65‐m‐thick section of the mudstone‐dominated Blue Mesa and Mesa Redondo members plausibly correlate to chrons E13r to E9n,

• bed-level stratigraphic resolution

Environment/lithology: fine channel fill; paleosol/pedogenic, green, blue, calcareous mudstone and paleosol/pedogenic mudstone

Size classes: macrofossils, mesofossils

Collected in 1998; reposited in the NMMNH

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

Primary reference: P. A. Murry and R. A. Long. 1989. Geology and paleontology of the Chinle Formation, Petrified Forest National Park and vicinity, Arizona and a discussion of vertebrate fossils of the southwestern Upper Triassic. In S. G. Lucas and A. P. Hunt (eds.), Dawn of the Age of Dinosaurs in the American Southwest, New Mexico Museum of Natural History, Albuquerque 29-64 [M. Carrano/M. Carrano/M. Carrano]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 48547: authorized by Matthew Carrano, entered by Matthew Carrano on 22.03.2005, edited by Richard Butler and Emma Dunne

Creative Commons license: CC BY (attribution)