Big Hill Beds, Maywood Road (Ordovician of the United States)

Where: Delta County, Michigan (45.8° N, 87.0° W: paleocoordinates 19.4° S, 55.3° 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

• Environmental call by T. Hanson.
• 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 26317: authorized by Steven Holland, entered by Tori Hanson on 12.10.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Protarea richmondensis
Protozoa
 Spumellaria -
Beatricea undulata
Beatricea undulata Billings 1857 radiolarian
Anthozoa
 Stauriida - Streptelasmatidae
"Streptelasma rusticum" = Helicelasma rusticum
"Streptelasma rusticum" = Helicelasma rusticum Billings 1858 horn coral
 Stauriida - Columnariidae
Columnaria alveolata
Columnaria alveolata Goldfuss 1826 horn coral
 Sarcinulida - Syringophyllidae
"Calapoecia cribriformis" = Calapoecia huronensis
"Calapoecia cribriformis" = Calapoecia huronensis Billings 1865 tabulate coral
Demospongiae
 Streptosclerophorida - Hindiidae
Hindia subrotunda
Stromatoporoidea
 Labechiida - Aulaceratidae
"Beatricea nodulifera" = Aulacera
"Beatricea nodulifera" = Aulacera stromatoporoid sponge
[entered as Beatricea nodilifera]
Bivalvia
 Ostreida - Pterineidae
Pterinea (Caritodens) demissa
Cephalopoda
 Pseudorthocerida - Spyroceratidae
Spyroceras sp.
Spyroceras sp. Hyatt 1884
 Actinocerida - Actinoceratidae
Actinoceras cf. bigsbyi
Gastropoda
 Murchisoniina - Lophospiridae
"Lophospira bicincta" = Lophospira milleri
"Lophospira bicincta" = Lophospira milleri Miller 1877 snail
Stenolaemata
 Trepostomata - Batostomellidae
Bythopora striata
 Cryptostomata - Rhinidictyidae
Pachydictya sp.
Pachydictya sp. Ulrich 1882
Strophomenata
 Strophomenida - Strophomenidae
Strophomena vetusta, Strophomena huronensis, Strophomena planumbona
Strophomena huronensis Foerste 1912
Strophomena planumbona Hall 1847
S. planumbona and S. planumbona elongata
Rhynchonellata
 Rhynchonellida - Rhynchotrematidae
"Rhynchotrema capax" = Hiscobeccus capax, Rhynchotrema perlamellosum
"Rhynchotrema capax" = Hiscobeccus capax Conrad 1842
 Orthida - Plectorthidae
Hebertella occidentalis
Hormogoneae
 Oscillatoriales - Girvanellaceae
Girvanella richmondensis