TRILOBITES OF THE PENTAGON SHALE:

Northwestern Montana

Pentagon Shale - Two localities: Pentagon Mountain and Lick Creek-Continental Divide - Deiss 1936

Trilobites:

Agnostus brevispinus
A. robustus
Bathyuriscus haydeni Meek, 1873[= Bathyuriscus formosis Deiss, 1939 (fida Robison, 1964)]
Ehmaniella concava (formerly Clappaspis concava)
Ehmaniella  convexa (formerly Clappaspis convexa)
Ehmaniella  hebetis (formerly Clappaspis hebetis)
Ehmaniella  lickensis (formerly Clappaspis lickensis)
Ehmaniella  mcnairi (formerly Clappaspis mcnairi)
Ehmaniella  obscura (formerly Clappaspis obscura)

Ehmaniella ornatus (formerly Anomalocephalus ornatus)
Ehmaniella  papulata (formerly Clappaspis papulata)
Ehmaniella  singularis (formerly Clappaspis singularis)
Ehmaniella  striata (formerly Clappaspis striata)
Ehmaniella  typica (formerly Clappaspis typica)
Ehmania convexa
E. elongata
E. exilis
E. incerta
E. perfecta
E. sulcata
E. unispinata
Elrathiella convexa
E. crassiorata
E. manifesta
E. nitida
E. plana
E. recta
E. sulcata
E. tenuis
E. unisulcata
E. valens
Kootenia pariquadriceps
K. serrata
K. subequalis
Parehmania arcuata
P. concava

P. cylindrica (formerly Rowia cylindrica)

P. delicata (formerly Rowia delicata)

P. granulata (formerly Rowia granulata)
P. princeps
P. quadrata
P. storeyi

P. vulgata(formerly Rowia vulgata)

Ptychoparella convexa (formerly Elrathina convexa)
Ptychoparella fecunda (formerly Elrathina fecunda)
Ptychoparella oculineata (formerly Elrathina oculineata)

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