Development of the Mississippian-Pennsylvanian Unconformity in Indiana

Loading...
Thumbnail Image
Can’t use the file because of accessibility barriers? Contact us with the title of the item, permanent link, and specifics of your accommodation need.

Date

1989

Journal Title

Journal ISSN

Volume Title

Publisher

Indiana Geological Survey

Abstract

In very early Pennsylvanian time the place nowcalled Indiana was the locus of subaerial erosion. About 8,000 square miles of this landscape is preserved in western Indiana beneath the rocks of the Pennsylvanian System. Data from 20,000 wells provide the evidence to reconstruct this surface and to describe its geomorphology. Six ancient physiographic regions that show clear relationships of landform to outcropping Mississippian bedrock have been identified. From north to south a distinctive topography is associated with each of the ancient outcrop areas of (1) the Borden Group, (2) the Sanders and Blue River Groups, (3) the West Baden Group, (4) the Stephensport Group, (5) the Tar Springs Formation through the Menard Limestone, and ( 6) the Palestine Sandstone through the Grove Church Shale. In northern Indiana the Mississippian-Pennsylvanian unconformity may represent as much as 8 million years of erosion. In southern Indiana that same unconformity may represent less than 3 million years of erosion.

Description

Keywords

Geomorphology in Indiana, Mississippian-Pennsylvanian unconformity

Citation

Droste, J. B., and Keller, S. J., 1989, Development of the Mississippian-Pennsylvanian unconformity in Indiana: Indiana Geological Survey Occasional Paper 55, 11 p., 7 figs.

Journal

DOI

Link(s) to data and video for this item

Relation

Rights

This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/2.5/ or send a letter to Creative Commons, 543 Howard Street, 5th Floor, San Francisco, California, 94105, USA.

Type

Technical Report