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In geology, a sill is a tabular sheet intrusion that has intruded between older layers of sedimentary rock, beds of volcanic lava or tuff, or along the direction of foliation in metamorphic rock. A sill is a concordant intrusive sheet , meaning that it does not cut across preexisting rock beds.
The highest point in Indiana is Hoosier Hill, at 1,257 feet (383 m) above sea level in northern Wayne County. Rural areas in the central portion of the state are typically composed of a patchwork of fields and forested areas. The geography of Central Indiana consists of gently rolling hills and sandstone ravines carved out by the retreating ...
The Mississippian Borden Group (sometimes Borden Formation) is a mapped bedrock unit in Kentucky, Indiana, Illinois, Ohio, West Virginia, [7] and Tennessee.It has many members, which has led some geologists to consider it a group (for example in Indiana [8]) rather than a formation (for example in Kentucky [1] [4]).
Geologically, the hill sits in the Dearborn Upland, an area of high terrain in southeast Indiana that sits on top of the geologic structure known as the Cincinnati Arch. However, Hoosier Hill is located in a portion of the upland buried underneath glacial debris known as the Tipton Till Plain. As a result, while the average elevation of this ...
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Rock formations of Indiana (1 C, 4 P) S. Stratigraphy of Indiana (2 C, 1 P) Pages in category "Geology of Indiana" The following 20 pages are in this category, out of ...
Pages in category "Geologic formations of Indiana" The following 8 pages are in this category, out of 8 total. This list may not reflect recent changes. B.
A sill swarm or sill complex in geology is a major group of sills intruded within continental crust. They are located under volcanic edifices, including flood basalt provinces and large lava plateaus. The volume of sill swarms can be similar to dike swarms. [1]