Jupiterimages/Polka Dot/Getty Images. The term CT scan stands for Computed Axial Tomography and is often referred to as a CAT scan. It is a noninvasive test that helps doctors diagnose medical conditions. The procedure can take anywhere from 15 minutes to one hour depending on the part of the body being scanned.
Hence, we suggest that the Anthropocene (formal or informal) be defined to begin historically at the moment of detonation of the Trinity A-bomb at Alamogordo, New Mexico, at 05:29:21 Mountain War Time (Â± 2 s) July 16, 1945 (= 11:29:21 Co-ordinated Universal Time = Greenwich Mean Time).ere, we evaluate when the Anthropocene might be considered to have begun, as sufficient relevant studies have already been published (notably, those concerned with stratigraphic examination of the Anthropocene in Waters et al., 2014a) for interim assessment of this question.
Written By: Mesozoic Era, second of Earthâs three major geologic eras of Phanerozoic time. Its name is derived from the Greek term for âmiddle life.â The Mesozoic Era began 252.2 million years ago, following the conclusion of the Paleozoic Era, and ended 66 million years ago, at the dawn of the Cenozoic Era. (See the geologic time scale.) The major divisions of the Mesozoic Era are, from oldest to youngest, the Triassic Period, the Jurassic Period, and the Cretaceous Period.