Where: Wabasha County, Minnesota (44.4° N, 91.2° W: paleocoordinates 20.4° S, 79.8° W)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Reno Member (Franconia Formation), Franconian (497.0 - 485.4 Ma)
• LITHOSTRATIGRAPHY: Reno Mbr of the Franconia Fm (following Berg 1953, 1954). STRATIGRAPHIC RELATIONS: From the Reno Mbr, the upper member of the Franconia Fm, which is underlain by the Tomah Mbr. The Franconia Fm is overlain by the Black Earth Mbr of the St Lawrence Fm. AGE: From the middle of the Ptychaspis striata zonule, Ptychaspis-Prosaukia Zone (Howell et al. 1944) of the Middle Croixan. STRATIGRAPHIC POSITION: Unit 1, 2 ft thick, at the base of a 40+ ft thick section.
• bed-level stratigraphic resolution
Environment/lithology: offshore; lithified, bioturbated, fine-grained, glauconitic sandstone
Size class: macrofossils
Preservation: cast, mold/impression
Reposited in the USNM
Collection methods: bulk, quarrying,
• COLLECTOR: R.E Grant. REPOSITORY: USNM
Primary reference: R. E. Grant. 1962. Trilobite distribution, upper Franconia Formation (Upper Cambrian), southeastern Minnestoa. Journal of Paleontology 36(5):965-998 [A. Miller/A. Hendy]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 62117: authorized by Austin Hendy, entered by Austin Hendy on 12.07.2006
Creative Commons license: CC BY (attribution)
Taxonomic list
Trilobita | |
Idahoia serapio Walcott 1924 trilobite | |
Ptychaspis striata trilobite
Ptychaspis miniscaensis Owen 1852 trilobite | |
Monocheilus anatinum Hall 1863 trilobite
Stigmaspis hudsonensis trilobite
Prosaukia ambigua Ulrich and Resser 1933 trilobite
Prosaukia misa Owen 1852 trilobite | |
Ellipsocephaloides gracilis trilobite |