Middle Run Formation |
---|
Stratigraphic range: Proterozoic |
Type | Formation |
---|
Underlies | Mount Simon Sandstone |
---|
Overlies | "East Granite-Rhyolite Province igneous and volcanic rocks" |
---|
Location |
---|
Country | United States |
---|
Extent | Indiana and Ohio |
---|
The Middle Run Formation is a geologic formation in Ohio. It dates back to the Precambrian. It was discovered in October 1987 when the United States Geological Survey dug a sample to learn more about Ohio's Precambrian basement rocks. Scientists estimated the boundary to be at 3,500 ft below the surface. After drilling through Mt. Simon sandstone, past the 3,500 ft mark, they were surprised to find more sandstone, which is the Middle Run Formation. Drilling in 1989 reached a depth of 5,370 ft of this same formation before the drill bit was stuck—without reaching the Precambrian basement rocks.[1]
- Earth sciences portal
- Ohio portal
- Paleontology portal
References
- ^ Camp, Mark J. (2006-10-15). Roadside Geology of Ohio (1st ed.). Missoula, MT: Mountain Press. pp. 75–76. ISBN 9780878425242.
- Generalized Stratigraphic Chart for Ohio
Chronostratigraphy of Indiana
Ph | Pz | C | ⁋ | Kasimovian | - McLeansboro Group
- Bond Formation, Mattoon Formation, Patoka Formation
|
---|
Moscovian | |
---|
Bashkirian | |
---|
|
---|
M | |
---|
|
---|
D | |
---|
S | |
---|
O | |
---|
Є | |
---|
|
---|
|
---|
pЄ | |
---|
| This article about a specific stratigraphic formation in Ohio is a stub. You can help Wikipedia by expanding it. |