Burlington Railroad exposure (near Pines Road crossing), near Oregon (Ordovician of the United States)

Where: Ogle County, Illinois (42.0° N, 89.4° W: paleocoordinates 21.9° S, 63.0° W)

• outcrop-level geographic resolution

When: Belodina compressa conodont zone, Mifflin Member (McGregor Formation), Blackriveran (457.3 - 449.6 Ma)

• formation-level stratigraphic resolution

Environment/lithology: argillaceous limestone

• Environmental call by T. Hanson.
• "Thinly bedded argillaceous and shaly fossiliferous limestone." Lithology from O. L. Karklins. 1987. Bryozoa from Rocklandian (Middle Ordovician) rocks of the Upper Mississippi Valley region. Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 :173-176. Edited by R. E. Sloan

Size class: macrofossils

Preservation: cast, mold/impression

Primary reference: J. E. Tofel and P.W. Bretsky. 1987. Middle Ordovician Lophospira (Archaeogastropoda) from the Upper Mississippi Valley. Journal of Paleontology 61(4):700-723 [P. Wagner/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 155374: authorized by Pete Wagner, entered by Pete Wagner on 10.04.2014

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Gastropoda
 Murchisoniina - Trochonematidae
Trochonema cf. umbilicata
 Murchisoniina - Lophospiridae
"Lophospira delicata n. sp." = Eunema centralis, Lophospira obliqua, Lophospira serrulata, Lophospira perangulata
"Lophospira delicata n. sp." = Eunema centralis Ulrich and Scofield 1897 snail
Lophospira obliqua Ulrich and Scofield 1897 snail
Lophospira serrulata Salter 1859 snail
Lophospira perangulata Hall 1847 snail
 Murchisoniina - Eotomariidae
Clathrospira subconica
Clathrospira subconica Hall 1847 snail
 Euomphalina - Helicotomidae
Helicotoma planulata
Helicotoma planulata Salter 1859 snail