Ravine 2 miles west of Clermont (Ordovician of the United States)

Where: Fayette County, Minnesota (43.0° N, 91.7° W: paleocoordinates 19.3° S, 60.0° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Elgin Formation, Richmondian (449.6 - 445.5 Ma)

• member-level stratigraphic resolution

Environment/lithology: limestone and shale

• Shale interbedded with limestone; sometimes dolomitic. Lithology from F. M. Swain. 1987. Middle and Upper Ordovician Ostracoda of Minnesota and Iowa. Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 :99-101. Edited by R. E. Sloan.

Size class: macrofossils

Reposited in the FMNH

Primary reference: L. Amati. 2014. Isoteline trilobites of the Viola Group (Ordovician: Oklahoma): systematics and stratigraphic occurrence. Oklahoma Geological Survey Bulletin 151:1-125 [P. Wagner/P. Wagner]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 164851: authorized by Pete Wagner, entered by Pete Wagner on 19.12.2014

Creative Commons license: CC BY (attribution)

Taxonomic list

• From Elias et. al. (1988)
Show authors, comments, and common names
Trilobita
 Asaphida - Asaphidae
"Megalaspis beckeri n. sp." = Ectenaspis beckeri
"Megalaspis beckeri n. sp." = Ectenaspis beckeri Slocom 1913 trilobite
Originally described by Slocum 1913