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Hace 5 días · The geologic time scale or geological time scale ( GTS) is a representation of time based on the rock record of Earth. It is a system of chronological dating that uses chronostratigraphy (the process of relating strata to time) and geochronology (a scientific branch of geology that aims to determine the age of rocks).
Hace 5 días · The most important evidence from which geologic history can be inferred is provided by the geometric relationships of rocks with respect to each other, particularly layered rocks, or strata, the relative ages of which may be determined by applying simple principles.
Hace 4 días · Due to the scarcity of fossils, Sedgwick used rock types to identify Cambrian strata. He was also slow in publishing further work. The clear fossil record of the Silurian, however, allowed Murchison to correlate rocks of a similar age across Europe and Russia, and on which he published extensively.
Hace 5 días · Geology, the fields of study concerned with the solid Earth. Included are sciences such as mineralogy, geodesy, and stratigraphy. Geology also explores geologic history, which provides a conceptual framework and overview of Earth’s evolution.
Hace 4 días · The stratigraphic chart of geologic time. The Triassic followed on the heels of the largest mass extinction event in the history of the Earth. This event occurred at the end of the Permian, when 85 to 95 percent of marine invertebrate species and 70 percent of terrestrial vertebrate genera died out.
Hace 5 días · The atmosphere of Earth is the planetary atmosphere of Earth, composed of a layer of gas mixture that surrounds the Earth's planetary surface (both lands and oceans), known collectively as air, with variable quantities of suspended aerosols and particulates (which create weather features such as clouds and hazes), all retained by ...
Hace 5 días · Geologic maps show where rock strata (layers) occur at Earth's surface or under a thin veneer of soil and vegetation. These maps have elaborate color patterns because their purpose is to depict many distinctive rock formations.
