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Geologic dating ppt

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This aspect of Werner's model was useful for explaining the origin of tilted sedimentary rocks.

Knowing that a certain rock was deposited in the “Pennsylvanian”, for example, may help the PG to interpret rocks in a certain area.Advances in stratigraphy and geochronology require that any time scale be periodically updated. Geological Survey (USGS), State geological surveys, academia, and other organizations have sought to create a consistent time scale to be used in communicating ages of geologic units in the United States. Therefore, Divisions of Geologic Time, which shows the major chronostratigraphic (position) and geochronologic (time) units, is intended to be a dynamic resource that will be modified to include accepted changes of unit names and boundary age estimates. Many international debates have occurred over names and boundaries of units, and various time scales have been used by the geoscience community. R., comp., 1983, The Decade of North American Geology [DNAG] 1983 geologic time scale: Geology, v. 1), which represents an update containing the unit names and boundary age estimates ratified by the International Commission on Stratigraphy (ICS). North American Commission on Stratigraphic Nomenclature, 2005, North American stratigraphic code: American Association of Petroleum Geologists Bulletin, v. Scientists should note that other published time scales may be used, provided that these are specified and referenced (for example, Palmer, 1983; Harland and others, 1990; Haq and Eysinga, 1998; Gradstein and others, 2004; Ogg and others, 2008). As the collisions tapered off the earth began to cool, forming a thin crust on its surface.As the cooling continued, water vapor began to escape and condense in the earth's early atmosphere.[Note: "mya" means "millions of years ago"] Ways to begin your exploration: * Dates from the International Commission on Stratigraphy's International Stratigraphic Chart, 2009; colors adopted from the Commission for the Geological Map of the World, 5/26/2011. Collins created this page, 11/26/94; Robert Guralnick and Brian R. By modern scientific calculations, the earth is many millions of years old.In the very beginning of earth's history, this planet was a giant, red hot, roiling, boiling sea of molten rock - a magma ocean.The heat had been generated by the repeated high speed collisions of much smaller bodies of space rocks that continually clumped together as they collided to form this planet.