[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Mesozoic in Wisconsin-Minnesota
Jason Spindler's question about the absence of dinosaurs in Indiana
prompted Jon Woolf to correctly explain the absence of Mesozoic strata
there (Digest 145). However, he also stated that there are no
Mesozoic strata in other Midwest places like Illinois-Kentucky and
Wisconsin-Minnesota. Russ Jacobson corrected by noting Cretaceous
strata in the Mississippi Embayment of Illinois-Kentucky, with a
nearby hadrosaur occurrence across the River in southeast Missouri.
Indeterminate Campanian hadrosaur bones have also been identified a
short distance downstream in western Tennessee.
I'd like to add that Cretaceous fluvial and residual strata of the
Windrow Formation are also known in western Wisconsin, and the
possibility of bone in these outliers is not unreasonable. More
importantly, Minnesota has an extensive exposure of mid Cretaceous
nonmarine and marine strata that has produced a variety of fossils,
including vertebrates. A possible hadrosaur bone tidbit (Turonian)
has been mentioned to me from the Milbank-Ortonville area of western
Minnesota, but I haven't yet examined the specimen. That area has
produced a diverse array of marine reptile and fish material. The
possibility of dinosaur fossils in Minnesota seems quite real.