St. Paul, Decorah Shales (Ordovician of the United States)

Where: Minnesota (45.0° N, 93.1° W: paleocoordinates 17.9° S, 62.7° W)

• coordinate estimated from map

When: Spechts Ferry Member (Decorah Formation), Rocklandian (460.9 - 449.5 Ma)

• "Black River (Decorah) Shales", in Bassler (1911)

•This shale is supposed to be equivalent to the Sprechts Ferry shale from elsewhere in Minnesota.

• member-level stratigraphic resolution

Environment/lithology: marine; shale

Size classes: macrofossils, mesofossils

Primary reference: R. S. Bassler. 1911. The early Paleozoic Bryozoa of the Baltic Provinces. Bulletin of the United States National Museum 77:1-375 [B. Kröger/B. Kröger]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 167573: authorized by Björn Kröger, entered by Björn Kröger on 24.03.2015, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

 Ribeirioida - Technophoridae
 Bellerophontida - Sinuitidae
"Protowarthia pervoluta" = Sinuites pervoluta2
"Protowarthia pervoluta" = Sinuites pervoluta2 Ulrich and Scofield 1897 snail
 Bellerophontida - Bucaniidae
"Conradella obliqua" = Phragmolites obliquus2
"Conradella obliqua" = Phragmolites obliquus2 Ulrich and Scofield 1897 snail
 Bellerophontida - Pterothecidae
"Carinaropsis phalera" = Carinaropsis cymbula2
"Carinaropsis phalera" = Carinaropsis cymbula2 Hall 1861 snail
 Archinacellida - Archinacellidae
Archinacella deleta2 Sardeson 1892
 Trepostomida -
Batostoma winchelli Ulrich 1893
Batostoma winchelli spinulosum
 Cryptostomata - Ptilodictyonidae
 Trepostomata - Halloporidae
Hallopora undulata Ulrich 1886