It has a continental to lagoonal sedimentary facies. During times of falling sea levels, evaporitic, dolomitic, lagoonal, and lacustrine facies were left behind. Flora and fauna are also indicative of variable terrestrial, lacustrine, saline and lagoonal associations. The two beds are separated by lagoonal limestones. Near Lacq, they change to lagoonal anhydrites. "Ptyctodus" lived in a nektonic carnivore type-ecology and in carbonate, lagoonal, and shallow subtidal environments. The Smoky Hollow Member preserves fluvial and lagoonal deposits. Heron Reef is a lagoonal platform reef. The lagoonal surface has a depth of . The subtidal facies show carbonate grainstones and lagoonal muds. It is commonly found in pelagic and lagoonal deposits, but mostly marine. Wardlaw and Collinson (1984) proposed that Hindeodus dominated in lagoonal facies. These sands contain fossil plants and lagoonal, swamp, and lacustrine diatoms. The strata composed of siltstones, shales and limestones were deposited in lagoonal and fluvial environments. The Smoky Hollow was deposited in non-marine environments, including lagoonal, coastal plain, and fluvial settings.