Abstract
Two unusual exposures of Pennsylvanian sediments occur adjacent to a tunnel along the Illinois Central Railroad in northwestern Pope County, Illinois. At the north end of the tunnel is an 1,800-foot exposure of a breccia probably Caseyville in age. At the south end, are two small imbricate overthrusts of Caseyville age. Midway between the pene-contemporaneous breccia and overthrusts is the McCormick fault zone-anticlinal trend. Both breccia and imbricate overthrusts are believed to be free gravity slides related to Caseyville activity of the McCormick fault zone-anticlinal trend. These exposures show that slide structures of appreciable magnitude are not limited to argillaceous sandstone sequences of major geosynclines but can also occur locally in the relatively clean sandstone sequences of intracratonic basins.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
