Holocystites-Eucalyptocrinites Assoc., Waukesha Dolomite (Silurian of the United States)

Where: Wisconsin (39.0° N, 85.3° W: paleocoordinates 28.1° S, 51.8° W)

• coordinate based on political unit

• local area-level geographic resolution

When: Waukesha Dolomite Formation, Wenlock (433.4 - 427.4 Ma)

• "Early-Middle Wenlockian?...Waukesha Dolomite senus Mikulic (1977): upper 46 cm of unit 3 of Frest et al. (1977)."

• member-level stratigraphic resolution

Environment/lithology: open shallow subtidal; dolomitic, glauconitic lime mudstone

• See lithology. "This assemblage is probably a mixed fauna [based on preservational evidence] occurring shoreward of BA 3-4 faunas, which are the liekly source of echinoderms and cephalopods [trilobites interpreted as autochthonous..."

•SEP environmental call based on given info and knowledge of regional strat.

• "The fossils are concentrated in a micritic sublithographic dolomite...most frequently as compressed molds...sometimes calcite replaced...most megafossils whole and mud-filled...matrix very fine-grained, cavity-free dolomite, apparently penecontemporaneously replacing original lime mud...[rare glauconite]..."

Primary reference: T. J. Frest, C. E. Brett, and B. J. Witzke. 1999. Caradocian-Gedinnian echinoderm associations of Central and Eastern North America. Paleocommunities--a case study from the Silurian and Lower Devonian 638-783 [M. Foote/K. Koverman/P. Wagner]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 26808: authorized by Michael Foote, entered by Michael Foote on 04.11.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Rhombifera
 Hemicosmitoida - Caryocrinitidae
Caryocrinites sp.
Crinoidea
 Monobathrida - Eucalyptocrinitidae
Eucalyptocrinites sp.
Eucalyptocrinites sp. Goldfuss 1831 Sea lily
 Sphaeronitida - Holocystitidae
"Holocystites (Holocystites) cylindricus" = Holocystites cylindricus, Holocystites (Holocystites) alternatus
"Holocystites (Holocystites) cylindricus" = Holocystites cylindricus Hall 1861
Cephalopoda
 Nautiloidea -
Nautiloidea indet.
Nautiloidea indet. Agassiz 1847 nautiloid
"Several cyrtocone genera"
 Orthocerida - Kionoceratidae
Kionoceras sp.
Kionoceras sp. Hyatt 1884
 Orthocerida - Dawsonoceratidae
Dawsonoceras sp.
Dawsonoceras sp. Hyatt 1884
Trilobita
 Corynexochida - Styginidae
Illaenoides sp., Scutellum sp.
Illaenoides sp. Weller 1907 trilobite
Scutellum sp. Pusch 1833 trilobite
 Phacopida - Cheiruridae
Cheirurus sp.
Cheirurus sp. Beyrich 1845 trilobite
 Phacopida - Dalmanitidae
Dalmanites sp.
Dalmanites sp. Barrande 1852 trilobite
 Phacopida - Calymenidae
Calymene sp.
Calymene sp. Brongniart 1822 trilobite