Crowley's Ridge is a low range of hills forming the only conspicuous feature in the topography of Northeastern Arkansas, and extends in a general north and south direction from the Missouri state line to the city of Helena, where it ends abruptly.
Proceedings of the Iowa Academy of Sciences
©1888 Iowa Academy of Science, Inc.
Call, R. Ellsworth
"The Geology of Crowley's Ridge, Arkansas,"
Proceedings of the Iowa Academy of Science, 1(Pt. 1), 52-53.
Available at: https://scholarworks.uni.edu/pias/vol1/iss1/25