See map: Google Maps
Although this clump looks something like modern bear scat, it is most likely an accretion. It has some of the characteristics we look for in coprolite: location near fossilized turtle remains and a crappy shape. However, microscopic examination of the chipped areas reveal a gritty aggregate of material. So unless it was formed by a large critter that ate a lot of dirt, it is most likely not a coprolite.