Vanuxemia beds, Dixon (Ordovician of the United States)

Where: Lee County, Illinois (41.8° N, 89.5° W: paleocoordinates 22.0° S, 63.2° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Phragmodus undatus conodont zone, Quimbys Mill Formation (Platteville Group), Turinian (460.9 - 449.5 Ma)

• PJW: Originally just given as Platteville Limestone, but this should be Quimby Mills. Originally called "Vanuxemia Beds"

• bed-level stratigraphic resolution

Environment/lithology: shallow subtidal; limestone

Size class: macrofossils

Preservation: cast

Reposited in the USNM

Primary reference: R. C. Frey. 1995. Middle and Upper Ordovician nautiloid cephalopods of the Cincinnati Arch region of Kentucky, Indiana, and Ohio. U.S. Geological Survey Professional Paper 1066P:1-126 [S. Holland/S. Holland]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 88007: authorized by Björn Kröger, entered by Torsten Liebrecht on 30.03.2009, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

Gastropoda
 Trochonematoidea - Trochonematidae
Trochonema beloitense Whitfield 1878 snail
Trochonema beachi Whitfield 1878 snail
 Trochonematoidea - Lophospiridae
"Gyronema duplicatum" = Gyronema semicarinatum, "Solenospira prisca" = Ectomaria prisca
"Gyronema duplicatum" = Gyronema semicarinatum Salter 1859 snail
"Solenospira prisca" = Ectomaria prisca Billings 1859 snail
 Euomphalina - Holopeidae
Holopea rotunda Ulrich and Scofield 1897 snail
 Euomphalina - Helicotomidae
Ophiletina sublaxa Ulrich and Scofield 1897 snail
Helicotoma umbilicata Ulrich and Scofield 1897 snail
 Euomphalina - Macluritidae
"Maclurea bigsbyi" = Maclurina bigsbyi
"Maclurea bigsbyi" = Maclurina bigsbyi Hall 1861 snail
 Bellerophontida - Sinuitidae
"Protowarthia rectangularis" = Sinuites rectangularis
"Protowarthia rectangularis" = Sinuites rectangularis Ulrich and Scofield 1897 snail
 Bellerophontida - Plectonotidae
Tetranota sexcarinata Ulrich and Scofield 1897 snail
 Bellerophontida - Bucaniidae
Salpingostoma buelli Whitfield 1878 snail
 Murchisoniina - Eotomariidae
"Eotomaria supracingulata" = Paraliospira supracingulata Billings 1857 snail
Clathrospira subconica Hall 1847 snail
Cephalopoda
 Orthocerida - Proteoceratidae
Monomuchites annularis Frey 1995
USNM 162068