| A composite photograph of two views of the same horn coral from the lower Silurian to lower Devonian Vaughn Gulch Limestone, Mazourka Canyon, Inyo County, California; at right is a close view of the corallite region at top of image at left (a corallite is the calcareous skeleton of a single coral polyp). Scientific name is Dalmanophyllum sp. The photograph is from a specific public domain document. |