ammonites
Dinosaur Hollow, PFV 20 (Triassic of the United States)

Also known as UCMP V84260, PEFO 85101

Where: Apache County, Arizona (35.1° N, 109.8° W: paleocoordinates 11.0° N, 48.3° W)

• coordinate based on nearby landmark

• small collection-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).

•1.5 to 3.1 metres above Painted Desert Sandstone 2; 34 m below Black Forest Tuff

• bed-level stratigraphic resolution

Environment/lithology: "floodplain"; sandstone and bioturbated, paleosol/pedogenic, ferruginous, blue, calcareous mudstone

• two superposed fining-upward sequences capped by reworked sandstone layer (Black Forest Bed). deposition in frequently avulsing, high-sinuosity fluvial system
• multistorey sandstone sheet with paleosol mudtsone intervals; latter contain intergrown carbonate nodules and ferruginous oxides, calcic horizons, root traces. "Bones are found in a unique, localized bluish pedogenically modified mudstone"

Size class: macrofossils

Collected in 1984-1985; reposited in the UCMP

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

Primary reference: R. A. Long and P. A. Murry. 1995. Late Triassic (Carnian and Norian) tetrapods from the southwestern United States. New Mexico Museum of Natural History and Science Bulletin 4:1-254 [M. Carrano/M. Carrano/M. Carrano] more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 48546: authorized by Matt Carrano, entered by Matt Carrano on 22.03.2005