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Platform (geology)
In geology, a platform is a continental area covered by relatively flat or gently tilted, mainly sedimentary strata, which overlie a basement of consolidated igneous or metamorphic rocks of an earlier deformation. Platforms, shields and the basement rocks together constitute cratons.〔Parker, Sybil P. (Ed.). 1997. ''McGraw-Hill Dictionary of Geology and Mineralogy''. New York: McGraw-Hill.〕 Platform sediments can be classified into the following groups: a "protoplatform" of memtamorphosed sediments at the bottom, a "quasiplatform" of slightly deformed sediments, a "cataplatform", and a "orthoplatform" at the top. The Mesoproterozoic Jotnian sediments of the Baltic area are examples of a "quasiplatform". The post-Ordovician rocks of the South American Platform are examples of an orthoplatform.
==See also==
*Carbonate platform
*East European Platform
*List of shields and cratons
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