Platform (geology)

In geology, platform sediments can be classified into the following groups: a "protoplatform" of metamorphosed sediments at the bottom, a "quasiplatform" of slightly deformed sediments, a "cataplatform", and an "orthoplatform" at the top. The Mesoproterozoic Jotnian sediments of the Baltic area are examples of a "quasiplatform".^[1] The post-Ordovician rocks of the South American Platform are examples of an orthoplatform.^[2]

Geologic provinces of the world (USGS)

Shield   Platform   Orogen   Basin   Large igneous province   Extended crust

Oceanic crust:   0–20 Ma   20–65 Ma   >65 Ma

Idealized cross-section of Earth's lithosphere, including the relationship between cratons, shields and platforms (Abbreviations: cb=cratonic basin, LIP=large igneous province, MOR=mid-ocean ridge)

See also

• Carbonate platform
• East European Platform
• List of shields and cratons