F-231 (Ordovician to of the United States)

Also known as Thaerodonta-Oniella community, Maquoketa Fm.

Where: Fillmore County, Minnesota (43.5° N, 91.8° W: paleocoordinates 19.0° S, 60.1° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Amplexograptus manitoulinensis graptolite zone, Elgin Member (Scales Formation), Maysvillian to Maysvillian (450.2 - 445.5 Ma)

• "U. Ord. (Richmondian? Ashgill)"

• bed-level stratigraphic resolution

Environment/lithology: shallow subtidal; lithified, cherty/siliceous limestone and gray, silty, cherty/siliceous dolomite

• "biomicrite alternating with unfossiliferous shale. (shaly dolos and siliceous sh[illeg.] beds. shallow water (prob deeper than Parker's Maquoketa). stable craton, interior. BA4"
• Lithosome II (Elgin Member) Limestones, sublithographic, in 1- to 2-inch beds, cherty, fossiliferous, alternating with shaly, cherty gray dolomite in 3- to 5-inch beds; limestone beds contain the Thaerodonta-Onniella community-48-55

Size class: macrofossils

Primary reference: T. N. Bayer. 1967. Repetitive benthonic community in the Maquoketa Fm. (Ordovician) of Minnesota. Journal of Paleontology 41(2):417-422 [P. Wagner/P. Wagner/P. Wagner]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 357: authorized by Jack Sepkoski, entered by Mike Sommers on 20.11.1998

Creative Commons license: CC BY (attribution)

Taxonomic list

• "T. N. Bayer, 1967. Repetitive benthonic community in the Maquoketa Fm. (Ord.) of MN" J. Paleo. 41:417-422"
Show authors, comments, and common names
unclassified
  -
Cornites sp.
Crinoidea
  -
Crinoidea indet.
Crinoidea indet. Miller 1821 Sea lily
crinoids
Pterobranchia
 Graptoloidea - Diplograptidae
Orthograptus sp.
Orthograptus sp. Lapworth 1873 graptolite
Deuteropoda
  -
Ostracoda indet.
Ostracoda indet. Latreille 1802 ostracod
ostracodes
Trilobita
 Phacopida - Pterygometopidae
Pterygometopus sp.
Pterygometopus sp. Schmidt 1881 trilobite
 Asaphida - Asaphidae
Isotelus sp.
Isotelus sp. Dekay 1824 trilobite
originally entered as "Isotellus sp."
Monoplacophora
  -
Monoplacophora indet.
Monoplacophora indet. Knight 1952
Tergomya, ? Cyrtonellida
Cephalopoda
 Nautiloidea -
? Nautiloidea indet.
? Nautiloidea indet. Agassiz 1847 nautiloid
cephalopods - originally entered as "? Nautiloidea indet."
Gastropoda
 Murchisoniina - Eotomariidae
? Liospira sp.
? Liospira sp. Ulrich and Scofield 1897 snail
gastropods; Archaeogastropoda - originally entered as "? Liospira sp."
Bivalvia
 Autobranchia -
Pterioida indet.
Pterioida indet. Newell 1965 clam
? Ambonychia; unid'd bivalves
 Myalinida - Ambonychiidae
"Byssonychia tenuis" = Ambonychia
"Byssonychia tenuis" = Ambonychia clam
originally entered as "Byssonichia tenuis"
 Ostreida - Pterineidae
Pterinea sp.
Pterinea sp. Goldfuss 1832 oyster
 Modiomorphida - Modiomorphidae
Orthodesma caniculatum
 Solemyida - Ctenodontidae
Ctenodonta similis
Strophomenata
 Strophomenida - Strophomenidae
Strophomena sp.
Strophomena sp. Rafinesque and De Blainville 1824
 Strophomenida - Sowerbyellidae
"Thaerodonta saxea" = Eochonetes recedens
"Thaerodonta saxea" = Eochonetes recedens Sardeson 1892
Rhynchonellata
 Rhynchonellida - Rhynchotrematidae
Lepidocyclus laddi
Lepidocyclus laddi Wang 1949
originally entered as "Lepidocyclas laddi"
 Orthida - Dalmanellidae
"Onniella quadrata" = Paucicrura quadrata
"Onniella quadrata" = Paucicrura quadrata Wang 1949
originally entered as "Oniella quadrata"
 Orthida - Plaesiomyidae
"Plaesiomys subquadrata" = Plaesiomys subquadratus
"Plaesiomys subquadrata" = Plaesiomys subquadratus Hall 1847
Stenolaemata
 Cryptostomata - Rhinidictyidae
Stictopora sp.
Stictopora sp. Hall 1847
these 3 bryoz's add upp to 6 specimens
 Trepostomata -
Trepostomata indet.
Trepostomata indet. Ulrich 1882
encrusting trepostome, these 3 bryoz's add upp to 6 specimens
 Trepostomata - Halloporidae
Hallopora sp.
Hallopora sp. Bassler 1911
these 3 bryoz's add upp to 6 specimens
Scyphozoa
 Conulariida - Conulariidae
Conularia sp.
Conularia sp. Miller 1820 jellyfish