The majority of Parks Township is located within the Conemaugh Group. The Conemaugh group splits into two different formations. The Glenshaw is lower and older. The Casselman is younger and higher. Parks Township Geology is all Pennsylvanian in age, being mostly older than 300 million years of age. I am still performing further research to determine more accurate ages for locales.
My particular dig sites appear to be somewhere between 310 – 312 million years of age.
Synclines and Anticlines
The Duquesne-Fairmount Syncline runs through Parks Township starting at Kepple Hill in the South and generally following North to the West of Dime Road (ALT PA 66). The Greensale-Sabinsville Anticline ends in the Township. While you can see a hill or valley over terrain, the formation geology below also rolls independently of what can be seen above the ground. A syncline is a fold that has dropped in elevation while an anticline is a fold that has risen.
Parks Township Formation Geology
There are several articles below that talk about local formations. These formations are groups of rock layers that make up the local bedrock. There are several correlations you can find with layers over great distances. The Ames Limestone as shown on the map below can also be found all the way over in the state of Ohio. It is made up of the same material and is there due to the same geologic process, in that case being the Ames Sea.
Published Articles about Local Geology Formations
Pennsylvania 310 million years ago
More Parks Township Geology Information
- Penn State University Libraries Digital Collections – Generalized geologic map of Armstrong County and locations of selected wells (1974)
More Reading About Paleogeography
- Paleomap Paleoatlas – EarthByte Group
- 250 Ma until present, tectonic reconstruction – EarthByte on YouTube
- Ancient Earth Globe – Dinosaur Database
- T.M. Berg, M.K. McInerney, J.H. Way, D.B. MacLachlan (1983) – Stratigraphic Correlation Chart of Pennsylvania
- Wagner, W. R.; Heyman, L.; Gray, R. E.; Belz, D. J.; Lund, R.; Cate, A. S.; and Edgerton, C. D. (1970) – Geology of the Pittsburgh Area, General Geology Report G 59, Pennsylvania Geological Survey, Fourth Series, Harrisburg, PA, 1970