ARCO Wunderlich #1 - North Dakota Geo Survey Well #8803: Richmondian, North Dakota

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Stenolaemata - Cryptostomata - Arthrostylidae
Sceptropora facula Ulrich 1888
28.4 %-specimens
Sceptropora florida Kiepura 1962
28.4 %-specimens
Arthroclema pentagonalis Lobdell 1992
1.5 %-specimens
Arthroclema brevis Lobdell 1992
28.2 %-specimens
Nematoporella falcata Lobdell 1992
2.0 %-specimens
Nematoporella ulrichi Lobdell 1992
1.1 %-specimens
Ulrichostylus costatus Lobdell 1992
2.0 %-specimens
Ulrichostylus dakotensis Lobdell 1992
8.3 %-specimens
see common names

Geography
Country:United States State/province:North Dakota
Coordinates: 47.9° North, 100.9° West (view map)
Paleocoordinates:11.3° South, 61.0° West
Basis of coordinate:based on nearby landmark
Geographic resolution:outcrop
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:Stony Mountain Member:Gunn
Stratigraphic resolution:member
Lithology and environment
Primary lithology:shelly/skeletal lithified packstone
Secondary lithology:gray lithified calcareous "shale"
Includes fossils?Y
Includes fossils?Y
Lithology description: "thin, relatively pure bioclastic limestone interbedded with calcareous shale or very argillaceous limestone. The shale or argillaceous limestone is largel reddish purple in outcrop. In the subsurface, it is medium olive gray or pinkish gray in eastern North Dakota, becoming darker olive gray in the central part of the state and almost black in the deepest wells in western North Dakota."
Environment:deep subtidal indet. Tectonic setting:cratonic basin
Geology comments: environment based on type section of Gunn Member north of Stony Mountain, Manitoba
Taphonomy
Modes of preservation:body,original calcite
Size of fossils:macrofossils
Collection methods and comments
Collection excludes:some macrofossils
Reason for describing collection:taxonomic analysis
Museum repositories:USNM
Metadata
Database number:64602
Authorizer:S. Holland Enterer:S. Holland
Modifier:S. Holland Research group:marine invertebrate
Created:2006-09-10 16:57:46 Last modified:2006-09-10 20:13:13
Access level:the public Released:2006-09-10 16:57:46
Creative Commons license:CC BY
Reference information

Primary reference:

18639.1% 5060F.K. Lobdell. 1992. Arthrostylidae (Bryozoa: Cryptostomata) fromthe Gunn Member, Stony Mountain Formation (Upper Ordovician), North Dakota and Manitoba. North Dakota Geological Survey Miscellaneous Series 76:99-115 [S. Holland/S. Holland]