Author:

Ravn,R.L.

Year:

1981

Title:

Preliminary observations on the palynology of Upper Dakota Formation Lignites in Northwest Iowa and Northeast Nebraska. (In: Cretaceous stratigraphy and sedimentation in Northwest Iowa, Northeast Nebraska and Southeast South Dakota)

Reference:

Ravn,R.L. (1981) Preliminary observations on the palynology of Upper Dakota Formation Lignites in Northwest Iowa and Northeast Nebraska. (In: Cretaceous stratigraphy and sedimentation in Northwest Iowa, Northeast Nebraska and Southeast South Dakota) Iowa Geological Survey,Guidebook Series # 4 P. 123- 127

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