Where: Itasca County, Minnesota (47.3° N, 93.3° W: paleocoordinates 46.0° N, 54.8° W)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Coleraine Formation, Turonian (93.9 - 89.8 Ma)
• "On the basis of the fauna [the fm.] is considered the age equivalent of the lower Benton in the Colorado series." TURONIAN info from R.E. Sloan (1964) The Cret. Syst. in MN; Minn. Geol. Surv. Rept. Invest. 5
• formation-level stratigraphic resolution
Environment/lithology: marine; poorly lithified, green shale and conglomerate
Collection methods: surface (in situ), mechanical,
• "During a 12 month period in 1937 and 1938 the writer studied in detail the Mesabi invertebrate fossil collection at the University of Minnesota...Good fossil specimens were difficult to find during the field season of 1937 when the writer visited the region."
Primary reference: H. R. Bergquist. 1944. Cretaceous of the Mesabi Iron Range, Minnesota. Journal of Paleontology 18(1):1-30 [J. Alroy/M. Sommers/J. Alroy]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 1987: authorized by John Alroy, entered by Mike Sommers on 15.06.1999, edited by Pete Wagner
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
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Bivalvia | |
Nucula coloradoensis nut clam | |
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Cymbophora emmonsi clam | |
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Tapes sp. Mühlfeld 1811 venus clam
"Tapes cyprimeriformis" = Cyprimeria cyprimeriformis Stanton 1893 venus clam | |
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"Cardium enstromi" = Granocardium enstromi
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Corbula kanabensis clam | |
Exogyra suborbiculata oyster | |
"Ostrea prudentia" = Flemingostrea prudentia, Ostrea congesta, "Ostrea staufferi" = Lopha staufferi, Ostrea gilei, Ostrea sp.
"Ostrea prudentia" = Flemingostrea prudentia White 1884 oyster
Ostrea congesta Conrad 1843 oyster
Ostrea sp. Linnaeus 1758 oyster | |
"Pteria gastrodes" = Phelopteria gastrodes
"Pteria gastrodes" = Phelopteria gastrodes Meek 1873 pearl oyster | |
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Pinna sp. Linnaeus 1758 oyster | |
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Anomia propatoris jingle | |
Lima utahensis file clam | |
Inoceramus fragilis Hall and Meek 1856 clam | |
Barbatia micronema clam | |
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Gastropoda | |
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"Actaeon propinquus" = Acteon
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Fusus shumardi snail | |
Gyrodes conradi moon snail | |
Epitonium sp. Bolten 1798 wentletrap | |
Cephalopoda | |
"? Metacalycoceras sp." = Calycoceras Hyatt 1900 ammonite originally entered as "? Metacalycoceras sp."
Acanthoceras sp. Neumayr 1875 ammonite | |
"Epengonoceras cf. dumblei" = Metengonoceras
"Epengonoceras cf. dumblei" = Metengonoceras ammonite originally entered as "Epengonoceras cf. dumblei"
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Scaphopoda | |
Dentalium sp. Linnaeus 1758 tusk shell | |
Lingulata | |
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Polychaeta | |
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Crustacea | |
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