The top of the Winkler Formation is the ledge at bottom right. Winkler Formation at Hackberry Mountain. The other two locations are the north slope of Wild Horse Mesa and Pinto Mountain. The people in the photograph are on a field trip with the Desert Research Symposium, held by the San Bernardino County Museum, May, 1995. There are numerous outcrops of meta-conglomerate in the area near the Golden Quail mine .
Conglomerate is a sedimentary rock of sand and rounded gravel.
When the rock is fractured, as the rock face is in this photograph, the fracture cuts right through what used to be individual pebbles, giving this natural terrazzo effect. Winkler Formation at Pinto Mountain. Julie looks for trilobite fossils in the Latham Shale. This is one of several outcrops of the Latham Shale in the Providence Mountains. Solitary horn coral found in Bonanza King Canyon.