TRILOBITES OF THE CHISHOLM SHALE GROUP

The Chisholm Formation (Middle Cambrian) is just below the Dome Limestone.

Trilobites:

HOUSE RANGE, UTAH

Alokistocare sp.

Glossopleura producta (Hall & Whitfield)

Kootenia sp.

Poliella? sp.

Proehmaniella basilica (Resser, 1945)

Trachycheilus? sp. A Sundberg, 1994

Zacanthoides walapai Sundberg, 1994

DRUM MOUNTAINS, UTAH

Alokistocare sp.

Glossopleura sp.

Proehmaniella basilica (Resser, 1945)

Olenoides n. sp. (although listed here in the Chisholm, this specimen is more likely referred to being from the Marjum Formation.)

Chisholm Shale of Nevada:

Achlysopsis n. sp.

Albertella helena

alokistocarid n. sp. aff. Piochaspis

Amecephalus packi (Resser, 1935)

Amecephalus piochensis (Walcott, 1886)

Athabaskia howelli (Walcott, 1886)

Glossopleura packi Resser, 1935

Piochaspis sellata Levi-Setti, 1993

Ptarmiganoides sp.

Zacanthoides cf. grabaui Pack, 1906

Zacanthoides typicalis (Walcott, 1886)

Zacanthoides n. sp.

REFERENCES:

Sundberg, Frederick A.; 1994. Corynexochida and Ptychopariida (Trilobita, Arthropoda) of the Ehmaniella Biozone (Middle Cambrian), Utah and Nevada. Natural History Museum of Los Angeles County - Contributions in Science, No.446 

*researched and compiled by James Cook, Andrew Milner and Kevin D. Brett