ammonites
Salmond Ranch egg site (Cretaceous of the United States)

Where: Teton County, Montana (47.8° N, 112.6° W: paleocoordinates 55.5° N, 79.1° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Horsethief Formation, Campanian (83.5 - 70.6 Ma)

• upper part of formation

• group of beds-level stratigraphic resolution

Environment/lithology: mire or swamp; carbonaceous siltstone and green, white siltstone

• barrier island and back-barrier environments with occasional dry intervals; locally described as "brackish-water marsh"
• "pale greenish-white siltsones and mudstones" as alternations within main sequence of carbonaceous siltstone

Size classes: macrofossils, mesofossils

Collection methods: surface (in situ),

Primary reference: C. J. Bibler and J. G. Schmitt. 1986. Barrier-island coastline deposition and paleogeographic implications of the Upper Cretaceous Horsethief Formation, Northern Disturbed Belt, Montana. The Mountain Geologist 23(4):113-127 [M. Carrano/M. Carrano] more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 64789: authorized by Matt Carrano, entered by Matt Carrano on 14.09.2006