Sediments are deposited via distal fluvial, lacustrine, deltaic, and marine depositional systems. Alluvial and lacustrine calcareous deposits occur throughout. Fossil land plants are recorded in terrestrial, lacustrine, fluvial and nearshore marine sediments. Glacial moraines, outwash plains, deltas, lacustrine deposits, and old shorelines are common. Limestones may also form in lacustrine and evaporite depositional environments. The Oligocene-Miocene sands accumulated in alluvial, lacustrine, and nearshore marine environments. Tufa forms either in fluvial channels or in lacustrine environments. Apart from river sediments, they also occur in lacustrine and marine deposits. The mudstones that contain most of the fossils represent overbank, lacustrine, and pedogenic deposits. It is within the riverine, lacustrine, and palustrine wetland ecosystem. Thin resistant lacustrine limestone layers and volcanic flows cap the mesas. The Atchafalaya Basin contains lacustrine and coastal delta landscapes. This may be related to deposition in a hypersaline lacustrine environment. Here, Charlotte developed even more illustrations with a focus on lacustrine limestones. Flora and fauna are also indicative of variable terrestrial, lacustrine, saline and lagoonal associations.