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)