Middle Tybo Shale, Stop 2.2, Tybo Canyon (Cambrian of the United States)

Where: Nevada (38.0° N, 116.0° W: paleocoordinates 3.2° S, 89.4° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Dunderbergia trilobite zone, Middle Member (Tybo Shale Formation), Dresbachian (501.0 - 485.4 Ma)

• Dunderbergia zone. Listed as Upper Dresbachian Age

• member-level stratigraphic resolution

Environment/lithology: slope; poorly lithified, green, calcareous shale

• Lower slope fan (outer fan fringe) with density current deposition of calcarenites (as evidenced by presence of plane-parallel laminations, cross laminations, and rare directional sole markings)
• Olive-green limy shale with subordinate amounts of thin-bedded (2-5 cm thick) calcarenite

Size class: macrofossils

Collection methods: Only including autochthonous taxa

Primary reference: H. E. Cook, M. E. Taylor, and J. F. Miller. 1989. Day 2: Late Cambrian and Early Ordovician stratigraphy, biostratigraphy and depositional environments, Hot Creek Range, Nevada. 28th International Geological Congress 28-36 [P. Novack-Gottshall/P. Hearn/M. Uhen]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 75437: authorized by Phil Novack-Gottshall, entered by Paul Hearn on 09.10.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

 Olenida - Pterocephaliidae
Morosa brevispina Palmer 1965 trilobite
 Olenida - Aphelaspidae
Litocephalus granulomarginatus Palmer 1960 trilobite
Erixanium multisegmentus Palmer 1965 trilobite
 Olenida - Olenidae
"Simulolenus wilsoni" = Olenus, Simulolenus granulatus
"Simulolenus wilsoni" = Olenus trilobite
Simulolenus granulatus Palmer 1960 trilobite
 Ptychopariida - Elviniidae
Elviniella laevis Palmer 1960 trilobite
Elburgia quinnensis Resser 1942 trilobite