Hello!
Great place to dig is the Penn Dixie Quarry, in Hamburg, NY - just
south of Buffalo and Niagra. See their website here:
http://www.penndixie.org/
Have dug there in the past for a nominal fee, and found lots of
Trilobites and other fossils. The staff are friendly and helpful. And
if you strike out, they might even give you a fossil or two!
Also - At the intersection of Milestrip and Abbot roads, there is a
Firehouse. Behind the firehouse is Smokes creek - big parking lot, and
picnic facillities. If you walk in the stream, there are things
weathering out of the shale. Trilobites, brachiopods, and corals.
Good Luck .
Tim, aka Fossildude19