108 m Bed, Stop 2.2, Tybo Canyon ( of the United States)

Where: Nevada (38.0° N, 116.0° W: paleocoordinates 4.7° S, 86.4° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Cordylodus proavus conodont zone, Middle Member (Hales Formation), Skullrockian (487.5 - 482.3 Ma)

• Missisquoia trilobite and Cordylodus proavus conodont zones. Listed as Tremadoc

• member-level stratigraphic resolution

Environment/lithology: slope; lithified, black, calcareous mudstone and lithified limestone

• Inner fan-feeder channel facies; slope fan with density, slide, debris, slump, and turbidity-flow deposition of limestone (calcarenites?) (as evidenced by presence of plane-parallel laminations, cross laminations, and rare directional sole markings) from shelf
• Black, thinly bedded, laminated lime mudstone interbedded with mass-transported limestone

Size class: macrofossils

Collection methods: Only including autochthonous taxa; unclear from text whether a sample or pooled samples

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 75440: authorized by Phil Novack-Gottshall, entered by Paul Hearn on 09.10.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Trilobita
 Corynexochida - Leiostegiidae
Ptychopleurites cf. bevifrons
 Ptychopariida - Plethopeltidae
Plethopeltis cf. arbucklensis
 Olenida - Olenidae
Parabolinella cf. tumifrons
Parabolinella cf. tumifrons Robison and Pantoja-Alor 1968 trilobite