ammonites
Lacey Point SW1, SMU 229, PFV 27 (Triassic of the United States)

Also known as "Dinosaur Hill", Mesa Mound, UCMP V82242, PEFO 85106

Where: Apache County, Arizona (35.0° N, 109.8° W: paleocoordinates 11.0° N, 48.3° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Petrified Forest Member (Chinle Formation), Norian (221.5 - 205.6 Ma)

• "Upper Petrified Forest Formation"; now known as the Petrified Forest Member (Woody 2003) or the Painted Desert Member of the Petrified Forest Formation (Heckert & Lucas 2002).

•Between 1st and 2nd Painted Desert Sandstones, about 27.4 m below Painted Desert Sandstone 2

•

•

•1.5 m from bottom of section; lower of two fossiliferous layers at Dinosaur Hill

• bed-level stratigraphic resolution

Environment/lithology: terrestrial; gray, red, silty, calcareous mudstone and paleosol/pedogenic, concretionary, gray, red, silty, calcareous mudstone

• "silty mudstone/cay pebble conglomerate at base (dark reddish brown 5 YR 3/3 with white mottled zones 2.5 Y 8/0 and calcareous pedogenic nodules) grading into silty mudstone (calcareous; decreasing carbonate nodules; weak red 2.5 YR 4/2 with light gray 2.5 Y 7/2 mottled zones ) grading into primary fossiliferous layer of calcareous silty mudstone (weak red 2.5 YR 4/2 with light gray 2.5 T 7/0 mottles) grading into calcareous silty mudstone (with fine-medium sand-size pedogenic carbonate nodules; weak red 2.5 YR 4/2 with mottled zones of light gray 2.5 Y 7/0)

Size classes: macrofossils, mesofossils

Collected by UCMP in 1982, 1985; reposited in the UCMP

Collection methods: mechanical,

• Microvertebrate material mistakenly referred by Murry & Long (1989) to the Dinosaur Hill locality is actually from this site. Updated faunal list is taken from Long & Murry (1995)

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: general faunal/floral analysis

PaleoDB collection 48421: authorized by Matt Carrano, entered by Matt Carrano on 18.03.2005, edited by Richard Butler