ammonites
Hidden Canyon, unnumbered collection, 80 ft above base of formation (Carboniferous of the United States)

Also known as Hidden Canyon collection 1.

Where: Arizona (36.5° N, 113.6° W: paleocoordinates 1.7° N, 43.5° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Watahomigi Formation (Supai Group), Morrowan (318.1 - 314.6 Ma)

• The Watahomigi is comprised of three informal units: a lower slope unit, a middle cliff unit, and an upper slope unit.

• group of beds-level stratigraphic resolution

Environment/lithology: shallow subtidal; lithified, fine, gray limestone and lithified siltstone

• Concealed slope, reddish surface, with thin ledges of reddish-brown siltstone, sandstone, and limestone, and patches of mudstone cropping out locally; limestone is light gray, aphantic to fine-grained, weathers cream-colored; siltstone is very friable, laminated. The unit is 106.5 feet thick.

Size class: macrofossils

Preservation: mold/impression

Primary reference: E. D. McKee. 1982. The Supai Group of the Grand Canyon. United States Geological Survey Professional Paper 1173 [J. Alroy/C. Simpson/C. Simpson] more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 42650: authorized by John Alroy, entered by Carl Simpson on 03.08.2004

Creative Commons license: CC BY-NC-ND (attribution-noncommercial-no derivatives)