Lane, A.E., 2018. The Echo Cliff structure: identification and analysis of a possible Kansan impact structure. unpublished thesis, Kansas State University, Manhattan, Kansas. https://krex.k-state.edu/dspace/handle/2097/38882 https://krex.k-state.edu/dspace/bitstream/handle/2097/38882/AdamLane2018.pdf
The abstract states: "...variations in the topography of the Precambrian basement and faulting from the Bolivar-Mansfield Tectonic Zone are responsible for the geophysical anomalies..." and "Therefore, there is currently no evidence in support of the claim that the Echo Cliff structure is an impact structure." Yours, Paul H.
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