Big Hill Beds, Sturgeon River (Ordovician of the United States)

Where: Delta County, Michigan (46.1° N, 86.6° W: paleocoordinates 19.3° S, 55.0° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Amorphognathus ordovicicus conodont zone, Big Hill Formation, Richmondian (449.6 - 445.5 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: brown, gray, argillaceous, cherty/siliceous limestone

• Argillaceous limestone, soft to hard, considerable siliceous material irregularly distributed throughoout. Common greenish inclusions. Light gray to brown.

Size class: macrofossils

Primary reference: R. C. Hussey. 1926. The Richmond Formation of Michigan. In E. S. McCartney (ed.), Michigan University Contributions from the Museum of Geology 2:113-188 [S. Holland/T. Hanson/S. Bruning]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 26333: authorized by Steven Holland, entered by Tori Hanson on 13.10.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Streptelasm rusticum
Gastropoda
 Murchisoniina - Lophospiridae
"Lophospira bicincta" = Lophospira milleri
"Lophospira bicincta" = Lophospira milleri Miller 1877 snail
Rhynchonellata
 Rhynchonellida - Rhynchotrematidae
Rhynchotrema cf. minnesotensis, Rhynchotrema perlamellosum, "Rhynchotrema capax" = Hiscobeccus capax
"Rhynchotrema capax" = Hiscobeccus capax Conrad 1842
 Orthida - Plectorthidae
Hebertella alveata
Hebertella alveata Foerste 1909
Strophomenata
 Strophomenida - Strophomenidae
Strophomena vetusta, Strophomena planumbona
Strophomena planumbona Hall 1847
S. planumbona elongata
Anthozoa
 Lichenariida - Lyoporidae
Lyopora goldfussi
Lyopora goldfussi Billings 1858 tabulate coral
 Heliolitida - Halysitidae
"Halysites gracilis" = Catenipora gracilis
"Halysites gracilis" = Catenipora gracilis Hall in Foster and Whitney 1851 tabulate coral