Dinosaur footprint

Left manus impression of Rhynchosauroides from the lower Lockatong in Arcola, PA. Olsen, P.E., 1986.

I found this image on:
http://digsfossils.com/fossils/footprints_pa_lockatong.html

also check out the book The Beginning of the age of Dinosaurs, Faunal Change Across the Triassic. By Kevin Padian. You can find the text on Google Books. http://www.google.com/books?id=lssj8lR0zXMC&pg=PA66&dq=arcola+pennsylvania&cd=2#v=onepage&q=arcola%20pennsylvania&f=false

It states the fossil was collected by P. Olsen (Paul E. Olsen) and Cynthia Banach.