The fossils , frequently found in St. Louis , include the Bryozoan - corals '' Lithostrotion `` and '' Lithostrotionella `` and the Rugosan '' Fenestrellina `` .
Fossils frequently found in St. Louis include the rugosan corals '' Lithostrotion `` and '' Lithostrotionella `` and the Bryozoan '' Fenestrellina `` .