Allegheny National Forest covers 512,998 acres of Northwest Pennsylvania. Two hundred years ago the forest was mostly Eastern Hemlock and American Beech, but today the area is comprised mostly of black cherry, maple and other hardwoods. The disappearance of hemlock began in the 1850s when tanneries started using hemlock bark as their source for curing leather. The industry received a great boost by the Civil War demand for harness, military equipment and industrial belting. By the end of the century, the tanning industry was a major forest industry in Pennsylvania. Goodbye Hemlock.
That sure is one green forest.