Locality 37m, shale beds (Pend Oreille Lake) (Cambrian of the United States)

Where: Idaho (48.0° N, 116.3° W: paleocoordinates 3.0° S, 82.9° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Rennie Shale Formation, Middle Cambrian (513.0 - 501.0 Ma)

Environment/lithology: lithified, micaceous, green, argillaceous shale and lithified, nodular, blue, cherty/siliceous limestone

• [The Rennie Shale] is only 50 to 75 feet thick and consists of soft olive argillaceous shale, sometimes micaceous...[limestone] nodules consist of an odd mixture of brown and blue limestone. Both sorts occur as distinct masses, sometimes sharply angular, but more frequently irregular in shape, and the change from one to the other is abrupt. The brown limestone, which looks like a fine sandstone is evidently rather pure calcium carbonate, judging from its rapid effervescence, and, since this portion of the rock does not scratch steel, it is assumed to be free of silica or sand. On the other hand, the blue limestone masses contain sand grains or silica, even though they also effervesce freely. Fossils are absent from the brown masses but are very abundant in the blue portions. Strangely, there are but two species of trilobites in these nodules...neither species has been recognized in the larger shale fauna."

Size class: macrofossils

Reposited in the USNM

Primary reference: C. E. Resser. 1938. Middle Cambrian fossils from Pend Oreille Lake, Idaho. Smithsonian Miscellaneous Collections 97(3):1-12 [M. Hopkins/M. Hopkins]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 127485: authorized by Melanie Hopkins, entered by Melanie Hopkins on 15.05.2012

Creative Commons license: CC BY (attribution)

Taxonomic list

Bryopsidophyceae
 Caulerpales - Caulerpaceae
Margaretia angustata n. sp. Resser 1938
Hyolitha
 Hyolithida - Hyolithidae
"Hyolithes idahoensis n. sp." = Haplophrentis carinatus
"Hyolithes idahoensis n. sp." = Haplophrentis carinatus Matthew 1899
Trilobita
 Ptychopariida -
Schistometopus typicalis n. gen. n. sp.
Schistometopus typicalis n. gen. n. sp. Resser 1938 trilobite
 Ptychopariida - Alokistocaridae
Elrathia longiceps n. sp. Resser 1938 trilobite
Elrathia sampsoni n. sp. Resser 1938 trilobite
 Corynexochida - Dolichometopidae
Glossopleura intermedia n. sp. Resser 1938 trilobite
 Life -
Urotheca sampsoni n. sp. Resser 1938