Wyoming bone fossil | |
This is a portion of a geologic map[1] of the area. The point of the red V is approximately where the rock was uncovered, in the Jurassic Sundance formation. | |
This is a view of the surrounding area from Sand Turn in the Big Horn Mountains. The red V points to where the rock was probably uncovered. The view is towards east. | |
The rancher was using a cat to prepare for building this fence, and removed large pieces of a limestone ledge. The debris was skidded into a ravine for erosion control. | |
Later, he found the fossil piece lying in the roadbed. This is a front view of the rock. The coin on the rock is a USA Sacajawea dollar. | |
Close up view of the front. | |
Another close up view of the front of the rock. | |
Back view of the rock. | |
Close up view of the back. | |
Most of the debris in the ravine was covered, with dirt and old barbed wire. This fossil fragment was visible. It is about an inch wide. The rock is wet. | |
Dr. David Martill of the University of Portsmouth has suggested that the original fossil was a humerus with radius and ulna, possibly an early Jurassic pliosauru such as Rhomaleosaurus, which would be the first such found in the United States. | |
[1] Langenheim, Reinbold and Tissue, in the Wyoming Geological Association Guidebook, Twenty-Eighth Annual Field Conference--1976, pp.97-105. |