Despite the circumstance that in the Iowa part of the Great Plains, lying between the Mississippi River and the Rocky Mountains, the deep well-drillings usually sink only to that famed aquifer, or artesian reservoir, the Peter sandstone, the ancient crystalline basement beneath all of the tall column of sedimentaries is entered in a number of instances. Touching the deeply buried pre-Cambric rocks in the northeastern part of the State is not so surprising inasmuch as soon beyond our boundaries these crystallines rise to the surface.
Proceedings of the Iowa Academy of Science
©1928 Iowa Academy of Science, Inc.
"Eastward Extension of Ancestral Rocky Mountains Geosyncline into Iowa,"
Proceedings of the Iowa Academy of Science, 35(1), 220-222.
Available at: https://scholarworks.uni.edu/pias/vol35/iss1/41