SS-30, Simpson Springs Mountains: Gasconadian, Texas

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Conodonta - Prioniodontida - Oistodontidae
Oistodus sp. Pander 1856
Gastropoda - Sinuopeidae
Rhombella ? umbilicata (Dake and Bridge 1932)
Cephalopoda - Orthocerida - Baltoceratidae
Baltoceratidae indet. Kobayashi 1935
Agnostida - Metagnostidae
Geragnostus sp. Howell 1935
Agnostida - Diplagnostidae
Pseudagnostus sp. Jaekel 1909
Agnostida - Agnostidae
Homagnostus sp. Howell 1935
Trilobita - Proetida - Dimeropygidae
Pseudohystricurus sp. Ross 1951
Trilobita - Proetida - Hystricuridae
Parahystricurus sp. Ross 1951
Trilobita - Olenida - Olenidae
Parabolinella sp. Brögger 1882
Trilobita - Corynexochida - Illaenuridae
Platycolpus sp. Raymond 1913
see common names

Geography
Country:United States State/province:Texas
Coordinates: 30.0° North, 103.3° West (view map)
Paleocoordinates:16.5° South, 92.4° West
Basis of coordinate:based on political unit
Time
Period: Ordovician Epoch: Early Ordovician
Stage: Tremadocian 10 m.y. bin: Ordovician 1
*Epoch:Tremadoc?
Key time interval: Gasconadian
Age range of interval: 485.4 - 477.7 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Woods Hollow Boulders Member:Upper
Stratigraphy comments: possibly not Tremadoc.
Lithology and environment
Primary lithology:glauconitic,green "limestone"
Lithology description: 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.
Environment:carbonate indet.
Geology comments: "ls boulders in dark green sh. outer shelf. BA5"
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:taxonomic analysis
Taxonomic list comments:"Wilson 1954"
Metadata
Also known as:Marathon Uplift, Woods Hollow Fm., Tremadoc?, Texas
Database number:282
Authorizer:J. Sepkoski, P. Wagner Enterer:M. Sommers, P. Wagner
Modifier:P. Wagner Research group:marine invertebrate
Created:1998-11-20 10:07:18 Last modified:2018-12-13 14:54:49
Access level:the public Released:1998-11-20 10:07:18
Creative Commons license:CC BY
Reference information

Primary reference:
26476. 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]