One of the first major fossil finds of the 20th century in Pennsylvania was the 1902 discovery of dinosaur tracks at a fisher's Quarry near Graterford in Montgomery County [REF].
Early in the mid-twentieth century came the 1952 Whilhelm Bock referred some of the Squirrel Hill footprints to the dinosaur ichnogenus Grallator, while the other reptile tracks he didn't think were dinosaurian [REF].