Hanson Creek Formation, Martin Ridge: Richmondian, Nevada

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Anthozoa - Stauriida - Streptelasmatidae
Streptelasma indet. Hall 1847
Anthozoa - Stauriida - Columnariidae
Columnaria sp. Goldfuss 1826
Anthozoa - Heliolitida - Halysitidae
Catenipora sp. Lamarck 1816
Strophomenata - Strophomenida - Rafinesquinidae
Rafinesquina sp. Hall and Clarke 1892
Rhynchonellata - Rhynchonellida - Rhynchotrematidae
Lepidocyclus sp. Wang 1949
Originally "Lepidocyclas sp." Assumed spelling error
Rhynchonellata - Orthida - Platystrophiidae
Platystrophia sp. King 1850
Trilobita - Trinucleida - Trinucleidae
Cryptolithus sp. Green 1832
Trilobita - Corynexochida - Illaenidae
Illaenidae indet. Hawle and Corda 1847
Pterobranchia - Graptoloidea - Diplograptidae
Orthograptus calcaratus
var. trifidus
Orthograptus sp. Lapworth 1873
Pterobranchia - Graptoloidea - Climacograptidae
Climacograptus tridentatus
var. maximus
Pterobranchia - Graptoloidea - Dicranograptidae
Dicellograptus complanatus Lapworth 1880
var. ornatus
see common names

Geography
Country:United States State/province:Nevada
Coordinates: 39.0° North, 116.0° West (view map)
Paleocoordinates:7.1° South, 74.5° West
Basis of coordinate:estimated from map
Geographic resolution:local area
Time
Period:Ordovician Epoch:Late/Upper Ordovician
10 m.y. bin:Ordovician 5
Key time interval:Richmondian
Age range of interval:449.50000 - 443.70000 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:2008-06-23 12:49:20
Access level:the public Released:2007-12-28 13:02:54
Creative Commons license:CC BY
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]