SS-38, Simpson Springs Mountains (Ordovician of the United States)

Also known as Marathon Uplift, Woods Hollow Fm., Tremadoc?, Texas

Where: Texas (30.0° N, 103.3° W: paleocoordinates 16.5° S, 92.4° W)

• coordinate based on political unit

When: Upper Member (Woods Hollow Boulders Formation), Gasconadian (485.4 - 477.7 Ma)

• possibly not Tremadoc.

Environment/lithology: marine; green conglomerate

• "ls boulders in dark green sh. outer shelf. BA5"
• Brownish gray mottled with purplish tinge, fine-grained, slightly sandy limestone of fragmental texture, with glauconitic matrix and phenoclasts of pink fine-grained limestone; some calcirudite mixed with fine-grained limestone; weathers purplish and is highly jointed.

Size class: macrofossils

Primary reference: J.L. Wilson. 1954. Late Cambrian and Early Ordovician Trilobites from the Marathon Uplift, Texas. Journal of Paleontology 28(3):249-285 [P. Wagner/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 78731: authorized by Pete Wagner, entered by Pete Wagner on 15.02.2008

Creative Commons license: CC BY (attribution)

Taxonomic list

• "Wilson 1954"
Trilobita
 Corynexochida - Illaenuridae
"Platycolpus cf. capax" = Rasettia
"Platycolpus cf. capax" = Rasettia trilobite
 Proetida - Dimeropygidae
Pseudohystricurus sp. Ross 1951 trilobite
 Asaphida -
Asaphida indet. Salter 1864 trilobite