Reddit mentions of Rockhounding New York: A Guide To The State's Best Rockhounding Sites (Rockhounding Series)

https://www.amazon.com/Rockhounding-New-York-Guide-States/dp/0762779004/ref=sr_1_3?keywords=fossil+guide+new+york&qid=1569523747&s=gateway&sr=8-3 Each state has its own guide...might want to try this

I would imagine there are books like this one...https://www.amazon.com/Rockhounding-New-York-Guide-States/dp/0762779004
I own the one for Oregon and it has given me some great info to start with. Also, take a look at local rock clubs.

http://www.herkimerdiamond.com is the only western-ish NY fee dig I'm aware of. This book has a list of rockhounding sites with appropriate maps/directions: https://www.amazon.com/Rockhounding-New-York-Guide-States/dp/0762779004?ie=UTF8&adid=02XDNXCXNHT0QN810XCY

here's another link that might help? http://albanykid.com/2010/05/24/rockhounding-new-york/

Rockhounding New England: A Guide To 100 Of The Region's Best Rockhounding Sites (Rockhounding Series) https://www.amazon.com/dp/0762783656/ref=cm_sw_r_other_awd_6X26wb5VVT2AP

Rockhounding New York: A Guide To The State's Best Rockhounding Sites (Rockhounding Series) https://www.amazon.com/dp/0762779004/ref=cm_sw_r_other_awd_KY26wbYF584VV

Roadside Geology of New York (Roadside Geology Series) https://www.amazon.com/dp/0878421807/ref=cm_sw_r_other_awd_dZ26wbRZZCT7B

The Collector's Guide to the Minerals of New York State (Schiffer Earth Science Monograph) https://www.amazon.com/dp/0764343343/ref=cm_sw_r_other_awd_DZ26wbH96TSC2

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I've found rockhounding books usually have good intros and brief explanations which is good for beginners.