| Crinoid columnals from the Lower Mississippian Tin Mountain Limestone, Funeral Range public lands area, Inyo County, California; the five-sided, star-like structure in the center of each columnal is where the axial canal existed in actual life--the central nerve and circulatory system that extended through the crinoid column; photographed with a Nikon CoolPix 995 digital camera and eventually edited and processed through photoshop (adding the black background, for one). |