I found this the other day and the distinct shape immediately caught my eye. It was found in the Raton basin at about 7500 feet. I found it on a hillside about 50 feet up from the river. There were many broken leaf fossils around and other interesting patterns that I believe were plant based (wood, roots, etc.) The rock is 4.75" x 3.25". The anomaly is 2.25" from edge of rock to the tip and about 1.5" at it's widest point.