Bear Gulch (ROM Collection) (Carboniferous of the United States)

Where: Fergus County, Montana (46.9° N, 109.0° W: paleocoordinates 5.4° N, 35.1° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Bear Gulch Member (Heath Formation), Arnsbergian (327.0 - 323.7 Ma)

• "Namurian E2b" (E2 = Arnsbergian)

• member-level stratigraphic resolution

Environment/lithology: open shallow subtidal; lithified, concretionary limestone

• "shallow, marine tropical bay" (Lund 1985)
• "rhythmically alternating sets of microturbidite beds and laminar beds" (Grogan and Lund 1997)

Size class: macrofossils

Preservation: adpression, concretion, soft parts

Reposited in the ROM

Collection methods: mechanical

Primary reference: E. D. Grogan and R. Lund. 2009. Two new iniopterygians (Chondrichthyes) from the Mississippian (Serpukhovian) Bear Gulch Limestone of Montana with evidence of a new form of chondrichthyan neurocranium. Acta Zoologica 90(Suppl. 1):134-151 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 130890: authorized by Matthew Clapham, entered by Matthew Clapham on 16.07.2012

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Osteichthyes
  -
Kalops diophrys n. sp.1
Kalops diophrys n. sp.1 Poplin and Lund 2002
Chondrichthyes
 Iniopterygia - Iniopterygidae
Rainerichthys zangerli
Rainerichthys zangerli Grogan and Lund 2009 cartilaginous fish
ROM 41128, 43153
Cephalopoda
 Coleoidea -
"Syllipsimopodi bideni n. gen. n. sp." = Gordoniconus beargulchensis2
"Syllipsimopodi bideni n. gen. n. sp." = Gordoniconus beargulchensis2 Mapes et al. 2010
ROMIP 64897
1Poplin and Lund 2002; 2Whalen and Landman 2022