67. Translocation of Iowa’s
The lofty Siouan Mountain range, which in Triassic times was upraised across northwestern part of our State, and which was comparable in every way to the present Appalachians of eastern United States, the Juras of France, or the Colorado Rockies of today, were quickly and completely razed to the level of the sea in Jurassic and Early Cretacic days. The disposal of this huge mass attracted little interest. It was naturally assumed that it was swept into the Mexican Gulf. It now transpires that this was only partially true; only the debris from the near side of the range was thus carried southward. The ruck-waste from the north flank found lodgement in large part in the Black Hills region, being represented there by no less than four very considerable formations of strictly epirotic character. So, another long and curiously missing chapter in Iowa's geological history is recovered and satisfactorily interpreted.
Proceedings of the Iowa Academy of Science
©1925 Iowa Academy of Science, Inc.
"Translocation of Iowa's Siouan Mountains,"
Proceedings of the Iowa Academy of Science, 32(1), 361-361.
Available at: https://scholarworks.uni.edu/pias/vol32/iss1/68