I found a 7mm thick layer of sediment which has a different coloration and is hard to break. The layer was running all the way through the hill which was a road cut. I found it near Natural Bridge Caverns in Comal County. I'm not sure if it really is the K-T boundary. I think it is because I found a Turritella Vertebroides which lived in the Latest creataceous period. Please help me Identify it.
Photo of Kt boundary quarter for scale ,Thanks