112419

Crinoid stem ossicle, partially silicified, in the partially dolomitized basal part of a small mound, Bangor Limestone, Mississippian, Haletown Tennessee. Silica is bright white and gray, calcite is red, dolomite is dull dark gray. Thin section photomicrograph, stained with alizarin red S, crossed polarizers, image 2.5 mm wide.