Abandoned Stonehouse Ranch site, Stonehouse Canyon, Little Snowy Mountains (Carboniferous of the United States)

Where: Montana (46.7° N, 109.1° W: paleocoordinates 3.3° N, 37.4° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Gnathodus bilineatus - Cavusgnathus charactus conodont zone, Otter Formation, Chesterian (335.5 - 323.2 Ma)

• Earliest Chesterian. (Gnathodus bilineatus - Cavusgnathus charactus is the earliest conodont zone, so I am entering that to communicate this.)

• formation-level stratigraphic resolution

Environment/lithology: limestone

Size classes: macrofossils, mesofossils

Reposited in the USNM

Primary reference: G. D. Webster and J. A. Waters. 2005. Early Chesterian Echinoderms from the Otter Formation of Central Montana. The Mountain Geologist 42(1):23-34 [P. Wagner/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 230495: authorized by Pete Wagner, entered by Pete Wagner on 28.06.2023

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Blastoidea
 Troosticrinida - Troosticrinidae
Diploblastus glaber
Diploblastus glaber Meek and Worthen 1869 blastoid
Crinoidea
 Dendrocrinida - Staphylocrinidae
Snowycrinus stonehouseensis n. gen. n. sp., Dinotocrinus otterensis n. sp.
Snowycrinus stonehouseensis n. gen. n. sp. Sea lily
Dinotocrinus otterensis n. sp. Sea lily
 Dendrocrinida - Blothrocrinidae
Blothrocrinidae indet.
Blothrocrinidae indet. Moore and Laudon 1943 Sea lily
 Dendrocrinida - Agassizocrinidae
Agassizocrinus cf. conicus