Locality 5, horizon 4, Amsden Fm., Brownback Gulch, Madison Co., Montana (Carboniferous of the United States)

Where: Madison County, Montana (45.8° N, 112.0° W: paleocoordinates 7.4° N, 36.1° W)

• small collection-level geographic resolution

When: Amsden Formation, Morrowan (323.2 - 318.6 Ma)

• beds numbered top to bottom, collection horizons bottom to top

• group of beds-level stratigraphic resolution

Environment/lithology: shallow subtidal; shelly/skeletal, gray wackestone and lime mudstone

• depositional environment described as "normal marine", sediments show signs of "reworking from tides and storms"
• limestone; light gray; beds 5-10 cm thick; mudstone to wackestone; scarce fossils

Preservation: replaced with silica

Collection methods: bulk, chemical, mechanical, peel or thin section, sieve,

Primary reference: D. P. Brewster. 1984. Stratigraphy, Biostratigraphy, and Depositonal History of the Big Snowy and Amsden Formations (Carboniferous) of Southwestern Montana. 1-164 [A. Miller/K. Layou/M. Uhen]more details

PaleoDB collection 6717: authorized by Arnold Miller, entered by Karen Layou on 13.03.2000

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Rachistognathus sp.
Conodonta
 Ozarkodinida -
"Hindeodella sp." = Ozarkodina
"Hindeodella sp." = Ozarkodina Branson and Mehl 1933 conodont
 Ozarkodinida - Cavusgnathidae
Adetognathus lautus, Adetognathus gigantus
 Prioniodontida - Prioniodinidae
"Neoprioniodus sp." = Idioprioniodus
"Neoprioniodus sp." = Idioprioniodus Gunnell 1933 conodont