Bighorn Formation Conodonts (Ordovician to of the United States)

Where: Wyoming (44.2° N, 106.7° W: paleocoordinates 10.5° S, 68.2° W)

• outcrop-level geographic resolution

When: Bighorn Formation, Blackriveran to Blackriveran (457.3 - 445.5 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: shallow subtidal; dolomite and sandstone

• Environments from S. Holland
• Dolomite is thick-bedded, massive, and buff.
Sandstone is both hard and soft, fine-, medium-, and coarse-grained, thin bedded.
There is red quartzite near the base of the bed.

Collection methods: chemical,

• All organisms in this collection are conodonts.

Primary reference: T. W. Amsden and A. K. Miller. 1942. Ordovician Conodonts from the Bighorn Mountains of Wyoming. Journal of Paleontology 16(30022):301-306 [S. Holland/T. Hanson]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 10442: authorized by Steven Holland, entered by Tori Hanson on 16.04.2001

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Cyrtoniodus complicatus, Cyrtoniodus erectus, Drepanodos sp., Polycaulodus bidentatus, Steroconus gracilis, Steroconus plenus, Steroconus robustus
Conodonta
 Protopanderodontida - Drepanoistodontidae
Paltodus sp.
Paltodus sp. Pander 1856 conodont
 Proconodontida - Cordylodontidae
Cordylodus ? concinnus
 Prioniodontida - Oistodontidae
Oistodus curvatus
 Prioniodontida -
Chirognathus alternata, Chirognathus curvidens, Chirognathus delicatulus, Chirognathus monodactyla, Chirognathus multidens, Chirognathus reversa, Chirognathus tenuidentatus, Chirognathus unguliformis, "Erismodus abbreviatus" = Erismodus, Erismodus typus, "Microcoelodus breviconus" = Erismodus, "? Pteroconus sp." = Erismodus, "Pteroconus gracilis" = Erismodus gracilis, "Microcoelodus unicornis" = Erismodus asymmetricus
"Erismodus abbreviatus" = Erismodus conodont
Erismodus typus Branson and Mehl 1933 conodont
"Microcoelodus breviconus" = Erismodus conodont
"? Pteroconus sp." = Erismodus conodont
"Pteroconus gracilis" = Erismodus gracilis Branson and Mehl 1933 conodont
"Microcoelodus unicornis" = Erismodus asymmetricus Branson and Mehl 1933 conodont
 Prioniodontida - Balognathidae
Lonchodus sp.
Lonchodus sp. Pander 1856 conodont
 Prioniodontida - Cyrtoniodontidae
Bryantodina sp.
Bryantodina sp. Stauffer 1935 conodont
 Prioniodontida - Acodontidae
"Acontiodus sp." = Acodus
"Acontiodus sp." = Acodus Pander 1856 conodont
  - Coleodontidae
Coleodus simplex, Neocoleodus spicatus