This 1877 reference compiles extensive level data and rock descriptions from Venango and Warren counties, offering a detailed view of early oil exploration. It blends historical notes with precise measurements, helping readers understand how geologists and operators documented wells in the formative years of the industry.

Learn how the records were gathered, organized, and used to interpret oil-bearing sands and red-rock formations.
Explore the early logbook-style data, including levels, rock types, and reported oil or gas shows across multiple localities.
See how one geologist’s method contributed to a broader map of the Oil Region’s geology and production history.
Find context about the practical challenges of recording and interpreting oil-well information in the era.

Ideal for readers of industrial history, early geology, and oil-field research who want a window into the beginnings of systematic well documentation and regional geology.

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