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Outline of Paleogeographical Reconstruction of Vietnam and Adjacent Regions During the Devonian
During the Devonian, eastern and southern Vietnam and adjacent areas in Laos and Kampuchea were the site of the Cathaysian Land, a late Caledonian positive area. A marginal transition zone lay to the west, and a shelf zone was present in the central area. Within the shelf zone a small Early Devonian intrashelf basin is thought to have been present since Silurian time. This basin is characterized by euxinic, fine grained terrigenous sediments containing a mainly pelagic fauna. Other parts of the shelf received shallow water carbonate-terrigenous sediments containing rich, level-bottom faunas of corals, brachiopods, pelecypods, crinoids and conodonts, etc. Acidic volcanic rocks are only seen in the marginal zone. The climate of the area during Lochkovian was tropical and semi-arid; it became humid during Pragian-Late Devonian time.
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