Recently and legally collected in private property along the Connecticut River Valley. These are the fossil impressions of a Theropod (raptor) that existed some 200 Million Years Ago. While the tracks themselves are called Grallator Tracks, they were likely created by Podokesaurus Holyokensis. The reason why the tracks have a separate name is because the tracks were discovered before the first remains of Podokesaurus.
On the back is a large Raised partial impression. Raised casts are created when new Sediments cover the original impressions and harden within them. On occasion when you split this Jurassic shale, you will get both the original negative impressions as well as these Raised casts. These tracks have been lightly polished with a clear sealant to help pop them out. The sealant May be washed or peeled off so the fossil can revert to its original state.