Northwestern Montana
Steamboat Limestone-on the crest of Prairie Reef - Deiss 1936
Trilobites:
Elrathiella prima (formerly Coelaspis prima)
Elrathiella cliffensis (formerly Glossocoryphus cliffensis)
Elrathiella typus (formerly Glossocoryphus typus)
Glyphaspis dearbornensis
G. indenta
G. similis
Kochaspis dearbornensis
K. resseri
K. unzia
K. upis
Parehmania inornata (formerly Mcnairia inornata)
Parehmania obscura (formerly Thomsonaspis obscura)
Parehmania striata (formerly Thomsonaspis striata)
REFERENCES:
Deiss,Charles (1939) Cambrian Stratigraphy and Trilobites of Northwestern Montana. The Geological Society of America, Special Papers, Number 18
Resser, C.E. (1935) Nomenclature of some Cambrian Trilobites, Smithsonian, Misc. Coll.., Vol. 93, No. 5, P. 1-46
*researched and compiled by George Ast, James Cook
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