We are a catalog of fossils found in Parks Township, Armstrong County. The county of Armstrong is located in the state of Pennsylvania within The United States. The city of Pittsburgh sits approximately 30 miles to the South West.

The fossil collection sites I explore are situated in an area embedded within the Glenshaw Formation. The formation consists of a series of ancient sea transgression and regressions that laid down layers of limestone. These limestone layers are generally the centers of what are known as marine zones. These zones carry abundant fossils. In between the zones lie series of shale and sandstone which also can carry fossils.

The marine zone I explore most is the Brush Creek Marine Zone, also known as the Brush Creek Limestone.

The Glenshaw is one of two formations in the Conemaugh Group. The Casselman Formation exists above at the hill tops, about a mile away. The boundary between the Glenshaw and the Casselman is a layer called the Ames Limestone. The Monongahela Group is exposed above the Casselman and the Allegheny Group is exposed below the Glenshaw Formation.

Generalized section of the Glenshaw Formation. The major strata horizons that have marine fossils are labeled using all caps.

All fossils I find are presumed to be from the Carboniferous Period of time, more specifically the Pennsylvanian. This time spans a period of 298.9 – 323.2 million years ago. You can find fossils locally in any type of rock. Local rocks include shale, limestone, sandstone or a mix of any of these. Generally fossils that I find are between 303 to 307 million years in age.

The Geology of Parks Township, Pennsylvania

One key to finding and identifying fossils is to understand the local geology. The Parks Township Geology page has a high level overview of the geology within the township boundaries. There is also information available for what Parks Township was like back in the age in which these fossils were being laid down, mostly during the Carboniferous Period of time.

Information Sheets

One of my goals is to occasionally publish information sheets. They are available here.

Global Fossil Information

Other Interesting Fossil Websites

Occasionally I find people doing similar work. Here are some good websites for fossil exploration.

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