List of Uplift Universe species | Uplift Universe | Llano, Texas | Llano | Tectonic uplift | Ciriaco del Llano | tectonic uplift | South Llano River State Park | Luis de Llano Macedo | Llano River | Llano Independent School District | Gonzalo Queipo de Llano |
In North America Clarkoceras is found in early Lower Ordovician, Gasconadian age shallow marine sediments near Smith Basin, State of New York, the Llano Uplift of Central Texas, and the El Paso Group of the eastern Rocky Mountains of Trans-Pecos Texas and Southern New Mexico.
The more extensive Ouachita system extends from the current range in Arkansas and Oklahoma southeast to the Black Warrior Basin in Alabama and to the southwest through the Llano, Marathon, and Solitario uplifts in Texas on into Coahuila and Chihuahua in Mexico.