| In western Millard County, Utah, near the eastern boundary with White Pine County, Nevada, the middle Mississippian Joana Limestone (yields locally abundant corals, brachiopods and crinoids, in particular) forms a massive ledge along the ridgeline, with the more recessive late Devonian to lower Mississippian Pilot Shale eroding along the slopes (contains many species of conodonts). Photograph courtesy Harry E Cook and James J. Corboy; I edited and processed the image through photoshop. |