These profiles are among the many fascinating illustrations included in the Geology of Pennsylvania: A Government Survey, by Henry Darwin Rogers, State Geologist, whose two oversized volumes, from 1858, describe many natural features of the state.
When I originally posted these images on the old PhillyH2o site in 2009, the two volumes of this survey were not available online. Now you can find them in several places. The best copies, with the best reproductions of the illustrations, were uploaded to the Internet Archive in 2016 by the State Library of Pennsylvania. As with all books on the Internet Archive, you can flip through them page by page; search by keyword; or download them in a variety of formats. You can even download high quality individual page images, if you have loads of patience and the ability to open multi-gigabyte .TAR files. PWD only has Volume 1 of the 1858 survey; the Internet Archive also has Volume 2.
A good overview of the four geological surveys of Pennsylvania was published in the magazine Pennsylvania Geology in February, 1987.
Finally, I can’t resist including the beautiful frontispiece of volume 1 below. In 2009 I scanned this from the PWD copy, but in the intervening years I lost the high-resolution scan. The thumbnail below is my scan, but the link goes to the Library of Congress, where you can download a high resolution file if you wish.
