This is a fantastic book. Be aware if you get the earlier editions that they may have blank page runs. This does not appear to be an issue in the newer printings. Be aware any of the copies from the 2010s are the same edition, just reprinting with a newer cover.
If you're familiar with the series Roadside Geology, I don't need to tell you more to convince you to buy. This is one of the classics.
If you're not familiar, buy this book and find out. It presents a very easy to understand guide to driving through the geology of the Keystone State. Clear directions are given for navigating the roads. This is a great companion book with Hoskins's collecting fossils and the big PA geology textbook.
The title says it all -- the geology of the earth as seen from your car.
This book is one of the Roadside Geology series, 35 books describing the geology of the US as revealed from the road. The many cuts made in the constructions of our roads and interstates show in spectacular detail how the earth was formed and continues to re-form. All the books in the series are wonderful, and can make a continuing joy out of a tedious car trip. HIGHLY RECOMMENDED, all 35 of them!
This is a great book from a series that provides a way for you to get more out of your travels by understanding the geology of areas you go through. It is informative for the layman, but something a geologist would also enjoy. Don't be put off by the technical aspects because the geology is described in ways anyone can understand.