Hanson Creek Formation, Martin Ridge: Richmondian, Nevada

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Anthozoa - Stauriida - Streptelasmatidae
Anthozoa - Stauriida - Disphyllidae
Columnaria sp. Goldfuss 1826
Anthozoa - Heliolitida - Halysitidae
Catenipora sp. Lamarck 1816
Rhynchonellata - Rhynchonellida - Rhynchotrematidae
Originally "Lepidocyclas sp." Assumed spelling error
Rhynchonellata - Orthida - Platystrophiidae
Strophomenata - Strophomenida - Rafinesquinidae
Rafinesquina sp. Hall and Clarke 1892
Trilobita - Trinucleida - Trinucleidae
Cryptolithus sp. Green 1832
Trilobita - Corynexochida - Illaenidae
Illaenidae indet. Hawle and Corda 1847
Pterobranchia - Graptoloidea - Climacograptidae
"Climacograptus tridentatus var. maximus"
Pterobranchia - Graptoloidea - Diplograptidae
"Orthograptus calcaratus var. trifidus"
Orthograptus sp. Lapworth 1873
Pterobranchia - Graptoloidea - Dicranograptidae
"Dicellograptus complanatus var. ornatus"
see common names

Geography
Country:United States State/province:Nevada
Coordinates: 39.0° North, 116.0° West (view map)
Paleocoordinates:9.2° South, 131.6° West (Wright 2013)
Basis of coordinate:estimated from map
Geographic resolution:local area
Time
Period: Ordovician Epoch: Late Ordovician
Stage: Katian 10 m.y. bin: Ordovician 5
Key time interval: Richmondian
Age range of interval: 449.6 - 445.5 m.y. ago
Stratigraphy
Formation:Hanson Creek
Stratigraphic resolution:group of beds
Stratigraphy comments: Listed as Middle Ashgillian
Lithology and environment
Primary lithology:very fine,gray lithified "limestone"
Lithology description: Dark gray, very fine-grained, platy and flaggy limestone
Environment:deep subtidal shelf
Geology comments: Lithology in the deeper water section more argillaceous than reported here (see Droser and Sheehan, 1995)
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils,mesofossils
Collection methods and comments
Reason for describing collection:biostratigraphic analysis
Metadata
Database number:77187
Authorizer:P. Novack-Gottshall Enterer:P. Hearn
Modifier:P. Novack-Gottshall Research group:marine invertebrate
Created:2007-12-28 13:02:54 Last modified:2025-02-22 15:12:02
Access level:the public Released:2007-12-28 13:02:54
Creative Commons license:CC0
Reference information

Primary reference:
26121. C. W. Merriam. 1963. Paleozoic rocks of Antelope Valley, Eureka and Nye Counties, Nevada. United States Geological Survey Professional Paper 423:1-67 [P. Novack-Gottshall/P. Hearn/P. Wagner]