The Black River: Deposits of Coal Silt Along the Susquehanna River, Pennsylvania

Summary

Deposits of coal silt are significant because they provide archaeologists a baseline for investigating changes in pre-industrial and post-industrial landscapes in Pennsylvania. Beginning in the 1790s, miners extracted coal from seams near the surface with a pick and shovel. Over the next 120 years, coal mining evolved into a booming industry. In 1917, production peaked at over 100 million tons. By 1950, geologists discovered reserves of crude oil and natural gas, leading to the overall decline of the anthracite coal industry. Today, coal is no longer a dominant part of the local economy. Coal mining generated enormous quantities of waste, including small pieces of unburnt coal and other non-economic materials. Waste from mines entered the Susquehanna River, mixed with naturally occurring sediments, and formed deposits of coal silt along the banks and mid-channel islands of the river. To understand the effect of coal silt on the river, I use processual archaeology to characterize and examine the Anthropocene – an informal geologic era defined by human induced changes to Earth’s ecosystems.

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