Upper Swarbrick Formation, Stop 2.1, 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: Swarbrick Formation, Dresbachian (501.0 - 485.4 Ma)

• Aphelaspis zone. Listed as Dresbachian Age

• formation-level stratigraphic resolution

Environment/lithology: basinal (); lithified lime mudstone and lithified, black chert

• Chert from intact sponge spicules, lime mud is pelagic or hemi-pelagic or dilute turbidites. Deep water, basin plain
• Resistant, silicified, gray, thinly laminated lime mudstone interbedded with black, laminated chert

Size classes: macrofossils, mesofossils

Preservation: replaced with silica

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 75428: authorized by Phil Novack-Gottshall, entered by Paul Hearn on 09.10.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

Porifera indet. Grant 1836
 Agnostida -
 Agnostida - Diplagnostidae
Pseudagnostus sp. Jaekel 1909
 Olenida - Aphelaspidae
Listroa toxoura Palmer 1962 trilobite
Originally Liostroa toxoura; assumed spelling error
Aphelaspis subditus Palmer 1962 trilobite