I found this in my backyard when planting a garden. I live in Eastern Long Island, on the South Fork. The fossil/rock is heavy with an irregular surface that makes me suspect it is a fossil rather than a rock. A previous owner of the property had a rock garden, so it is possible that this came from them. It was also right next to a recently constructed garage, so it might have been unearthed when the garage foundations was being built. Any help identifying it will be be appreciated.
Jim