Moodustis
Moodustis is a geological term used in Estonian stratigraphy to refer to a formal unit of rock that can be mapped over a region. It corresponds to the English term formation and represents a coherent body of rock that shares distinctive lithology, fossil content, or depositional history.
Moodustis boundaries are defined by changes in rock type or other distinguishing features at the top and
Most moodustis are named after a geographic locality or a characteristic rock type, for example, a limestone
Moodustises are used to describe depositional environments and the geological history of an area, and they