Stricklandia laevis Community, Hopkinton Formation, Eastern Iowa (Silurian of the United States)

Where: Iowa (43.0° N, 91.0° W: paleocoordinates 20.3° S, 55.3° W)

• coordinate based on political unit

• local area-level geographic resolution

When: Hopkinton Formation, Telychian (438.5 - 433.4 Ma)

• Principally from the Farmers Creek Member.

• formation-level stratigraphic resolution

Environment/lithology: deep subtidal ramp; dolomitic, shelly/skeletal wackestone

• valves often articulated, as are echinoderm cups, suggesting general absence of strong bottom currents; below normal wave base within photic zone; probably BA 4; some overlap with BA 3 associations by occasional presence of Pentamerus

•SEP environmental call based on given description and same vol. page 807.

• "skeletal wackestone lithologies (dolomitized) and the skeletal material is unabraded"

Collection methods: I have combined seven localities (with abundances) in table 50.12, as well as other taxa mentioned in text. Not all higher taxa treated in the same detail as the brachiopods. See Frest et al. (1999--PBDB ref. 4379) for echinoderms.

Primary reference: B. J. Witzke and M. E. Johnson. 1999. Silurian brachiopod and related benthic communities from carbonate platform and mound environments of Iowa and surrounding areas. In A. J. Boucot and J. D. Lawson (eds.), Paleocommunities--a case study from the Silurian and Lower Devonian 806-840 [M. Foote/M. Foote/M. Foote]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 25038: authorized by Michael Foote, entered by Michael Foote on 26.08.2002, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Chlorophyceae
 Dasycladales - Dasycladaceae
Cyclocrinites sp. Stolley 1898
calcareous algae
unclassified
  -
Porifera indet. Grant 1836
triaxon spicules
Anthozoa
 Rugosa -
Rugosa indet. horn coral
solitary rugosan sp. 1
 Heliolitida - Halysitidae
Halysites sp. von Waldheim 1813 tabulate coral
 Favositida - Favositidae
Favosites sp. Lamarck 1816 tabulate coral
unclassified
  -
Echinodermata indet. Klein 1754
indet. cups
Crinoidea
 Diplobathrida - Dimerocrinitidae
Dimerocrinites sp. Phillips 1839 Sea lily
Dimerocrinites (E.) sp.
 Monobathrida - Carpocrinidae
 Monobathrida - Patelliocrinidae
Trilobita
 Corynexochida - Illaenidae
Stenopareia sp. Holm 1886 trilobite
 Lichida - Lichidae
Arctinurus sp. Castelnau 1843 trilobite
 Phacopida - Calymenidae
Calymenidae indet. Milne-Edwards 1840 trilobite
 Phacopida - Encrinuridae
Encrinuridae indet. Angelin 1854 trilobite
Gastropoda
 Euomphalina - Euomphalidae
Straparollus sp. de Montfort 1810 snail
 Euomphalina - Platyceratidae
Cyclonema sp. Hall 1852 snail
Platyceras sp. Conrad 1840 snail
 Murchisoniina - Phanerotrematidae
Phanerotrema sp. Fischer 1885 snail
 Murchisoniina -
Murchisonioidea indet. Koken 1896 snail
Cephalopoda
 Nautiloidea -
Nautiloidea indet. Agassiz 1847 nautiloid
Rostroconchia
  -
Rostroconchia indet. Pojeta et al. 1972
Bivalvia
  -
"Pelecypoda indet." = Bivalvia
"Pelecypoda indet." = Bivalvia Linnaeus 1758 clam
Craniata
 Trimerellida - Trimerellidae
Dinobolus sp. Hall 1871
Chileata
 Dictyonellida - Eichwaldiidae
"Dictyonella sp." = Eodictyonella
"Dictyonella sp." = Eodictyonella Wright 1994
Strophomenata
 Orthotetida - Chilidiopsidae
"Coolinia sp." = Fardenia (Coolinia)
"Coolinia sp." = Fardenia (Coolinia) Bancroft 1949
name corrected from "Coolina"
 Strophomenida - Leptostrophiidae
 Strophomenida - Rafinesquinidae
Leptaena rhomboidalis Wahlenberg 1818
 Strophomenida - Sowerbyellidae
Eoplectodonta sp. Kozlowski 1929
Rhynchonellata
 Pentamerida - Stricklandiidae
 Pentamerida - Pentameridae
Pentamerus oblongus de Sowerby 1839
 Orthida -
Orthida indet. Schuchert and Cooper 1932
 Orthida - Linoporellidae
Linoporella sp. Schuchert and Cooper 1931
 Orthida - Dalmanellidae
Isorthis sp. Kozlowski 1929
Resserella sp. Bancroft 1928
 Orthida - Dicoelosiidae
Dicoelosia sp. King 1850
 Orthida - Platystrophiidae
"Platystrophia biforata" = Platystrophia biforatus
"Platystrophia biforata" = Platystrophia biforatus Schlotheim 1820
 Rhynchonellida - Machaerariidae
Ferganella sp. Nikiforova 1937
 Atrypida - Atrypidae
Atrypa reticularis Linnaeus 1758
species name in quotes
 Athyridida - Nucleospiridae
Nucleospira sp. Hall 1859
 Athyridida - Meristellidae
Whitfieldella sp. Hall and Clarke 1893
Meristina sp. Hall 1867
Stenolaemata
 Cryptostomata -
Cryptostomata indet. Vine 1884
branching forms
 Cryptostomata - Fenestellidae