In examining the rock exposures in a quarry near the village of Robins, Linn County, Iowa, Mr. R. B. Van Cleve reported finding plant remains in Des Moines sandstone associated with rocks of the Wapsipinnicon Stage of the Iowa Lower Devonian. Exposures of a terrane carrying a fauna of Devonian age apparently below the Gyroceras beds of the Cedar Valley have been found in Buchanan County and in well drillings containing species of the same fauna in Linn County. This terrane is known as the Independence and has been regarded as older than the Cedar Valley, although the fauna is similar to that of the Upper Devonian Lime Creek formation of Cerro Gordo County. The discovery by the writer of an extensive exposure of this terrane along the highway west of Middle Amana re-opened the question of the validity of the above interpretation. The finding of Des Moines associated with the Fayette Breccia is regarded as having an important bearing on the question.
Proceedings of the Iowa Academy of Science
©1938 Iowa Academy of Science, Inc.
Stookey, S. W.
"Sandstone of Des Moines Age in Fayette Breccia at Robins, Iowa,"
Proceedings of the Iowa Academy of Science, 45(1), 163-163.
Available at: https://scholarworks.uni.edu/pias/vol45/iss1/31