Geological Stage

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Stage, Geological

a subdivision of the general stratigraphic scale, subordinate to a geological series. A stage is subdivided into stratigraphic zones. It includes the stratum of rocks that formed in one geological age and corresponds to a definite phase in the geological development of the earth. The chief criterion for the establishment of the size and boundaries of a stage is the findings of biostratigraphic analysis. Most stages identified on the basis of open marine basins correspond to terrestrial subdivisions.

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No references found			Extinction rates vary widely between geological stages, he notes. Groups surviving mass extinction still go bust. ((Evolution's Death ... by Cobb, K. / Science News If he is right, Mars evolved in several distinct geological stages. New theory of how Mars was shaped by USA Today (Magazine)			geologic log geologic map geologic noise geologic province Geologic Section geologic structure geologic thermometer geologic thermometry geologic time geologic time scale geologic timescale Geological Committee Geolkom Geological Contact Geological Documentation Geological Education Geological Epoch Geological Era Geological Institute GIN Geological Journals Geological Maps geological oceanography Geological Pick-Hammer Geological Prospecting Geological Sciences, Institute of Geological Series Geological Stage geological steering Geological Survey Geological Survey, United States Geological Surveying Geological Thermometry geological transportation Geologiia i Geofizika Geologiia Nefti i Gaza Geologiia Rudnykh Mestorozhdenii geologist geolograph Geology Geology and Fossil Fuel Treatment, Institute of IGIRGI Geology and Geophysics, Institute of IGiG Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Geology, Dynamic Geology, Military geomagnetic coordinates geomagnetic cutoff geomagnetic dipole geomagnetic electrokinetograph geomagnetic equator geomagnetic field geomagnetic field reversal Geomagnetic Latitude			Geological Processes and Mineral Resources Geological Prospecting Geological Remote Sensing Group Geological Research and Development Centre Geological Sciences Geological Sciences Geological Sciences Student Research Symposium Geological Sciences, Institute of Geological Series Geological Society of Africa Geological Society of Alexandria University Geological Society of America Geological Society of America Bulletin Geological Society of America Special Papers Geological Society of America, Inc. Geological Society of Australia Geological Society of Glasgow Geological Society of Iran Geological Society of Malaysia Geological Society of Nevada Geological Society of New Hampshire Geological Society of New Zealand Geological Society of South Africa Geological Society of Sri Lanka Geological Society of Trinidad & Tobago Geological Stage geological steering Geological strata Geological strata Geological strata Geological strata Geological Strength Index Geological survey Geological survey Geological survey Geological Survey and Mineral Resources Board Geological Survey and Mines Bureau Geological Survey and Resource Assessment Division Geological Survey Institute Geological Survey of Alabama Geological Survey of Canada Geological Survey of Egypt Geological Survey of Ethiopia Geological Survey of Finland Geological Survey of Great Britain Geological Survey of India Geological Survey of India Training Institute Geological Survey of Iran, North East Territory Geological Survey of Ireland Geological Survey of Japan Geological Survey of Namibia Geological Survey of New South Wales Geological Survey of Northern Ireland Geological Survey of Pakistan Geological Survey of the Netherlands

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