Fossils are very rare, consisting of pelagic organisms. Mostly a highly silicified black shale containing beds that are brecciated and recemented with amorphous silica. Glauconitic and phosphatic layers are sometimes common. Locally at the top of the Huntersville is the glauconitic Bob's Ridge Sandstone, which is approximately 3 feet thick. Fossils may be present, but they are not common.
Some exposures have silica cement rather than calcite cement.
Fossils may be common, including molds of brachiopods and crinoid stems. The contact between the Oriskany and underlying Licking Creek Limestone is often gradational. Shallow water limestones ranging from carbonate mudstone to grainstone, usually gray in color. The Licking Creek Limestone is fossiliferous and often cherty. The Healing Springs Sandstone, which is up to 90 feet thick, has silica cement, contains abundant crinoid stem molds, and weathers a very distinct light brown.