Geologic Time Scale - A categorization of geological events based on successively smaller time spans: eons, eras, periods, epochs, and ages. The partitions of the geologic time scale is the same everywhere on Earth; however, rocks may or may not be present at a given location depending on the geologic activity going on during a particular period of time. This is the same principle used to determine relative age in the trash pits discussed previously. The Karoo Supergroup is the most widespread stratigraphic unit in Africa south of the Kalahari Desert.The supergroup consists of a sequence of units, mostly of nonmarine origin, deposited between the Late Carboniferous and Early Jurassic, a period of about 120 million years.. Current COVID-19 Operating Status. Hadean - The earliest eon in the history of the Earth from the first accretion of planetary material until the date of the oldest known rocks. Due to the COVID-19 pandemic, The Smithsonian National Museum of Natural History currently remains in a closed status for collections activities, including acquisition of collections, acceptance of donated collections, sampling, photography and other information or service requests, and incoming and outgoing loans. The geology of the Moon (sometimes called selenology, although the latter term can refer more generally to "lunar science") is quite different from that of Earth.The Moon lacks a true atmosphere, which eliminates erosion due to weather.It does not have any known form of plate tectonics, it has a lower gravity, and because of its small size, it cooled faster. Thus, in a sequence of layers that have not been overturned by a later deformational event, the oldest layer will be on the bottom and the youngest layer on top.
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