Where: Itasca County, Minnesota (47.3° N, 93.4° W: paleocoordinates 46.0° N, 55.0° W)
• coordinate based on nearby landmark
• local area-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 1990: authorized by John Alroy, entered by Mike Sommers on 15.06.1999, edited by Austin Hendy and Pete Wagner
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
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Polychaeta | |
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Bivalvia | |
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Inoceramus fragilis Hall and Meek 1856 clam | |
Ostrea congesta Conrad 1843 oyster
Ostrea prudentia oyster | |
Exogyra suborbiculata oyster | |
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Cephalopoda | |
"Epengonoceras cf. dumblei" = Metengonoceras
"Epengonoceras cf. dumblei" = Metengonoceras ammonite originally entered as "Epengonoceras cf. dumblei"
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Crustacea | |
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