quarry of the Medusa Portland Cement, Rock River, Dixon, Lee County (Ordovician of the United States)

Where: illinois (41.9° N, 89.4° W: paleocoordinates 22.0° S, 63.2° W)

• coordinate stated in text

• hand sample-level geographic resolution

When: Wallgreen Member (Grand Detour Formation), Blackriveran (457.3 - 449.6 Ma)

• bed-level stratigraphic resolution

Environment/lithology: lithified limestone

• Calcarentie

Size classes: macrofossils, mesofossils, microfossils

Primary reference: D. R. Kolata. 1975. Middle Ordovician echinoderms from northern Illinois and southern Wisconsin. Journal of Paleontology Memoir 49(3):1-74 [G. Webster/G. Webster]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 195626: authorized by Pete Wagner, entered by Pete Wagner on 15.08.2018

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Echinoidea
 Bothriocidaroida - Bothriocidaridae
Bothriocidaris solemi n. sp.
Bothriocidaris solemi n. sp. sea urchin
Crinoidea
 Porocrinida -
Porocrinus pentagonius
 Calceocrinida - Calceocrinidae
Cremacrinus sp.
Cremacrinus sp. Ulrich 1886 Sea lily
 Homocrinida - Cincinnaticrinidae
Isotomocrinus minutus n. sp.
Isotomocrinus minutus n. sp. Sea lily
 Diplobathrida - Rhodocrinitidae
Rhaphanocrinus buckleyi n. sp.
 Monobathrida - Glyptocrinidae
Glyptocrinus charltoni
 Rhombifera - Pleurocystitidae
Praepleurocystis sp.
 Rhombifera - Cheirocrinidae
Coronocystis durandensis n. sp.
Coronocystis durandensis n. sp. Kolata 1975
Cyclocystoidea
  - Cyclocystoididae
Cyclocystoides aff. halli