THE REDISH CLAYS OF THE MARINE- COASTAL TERRITORY OF CUBA
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Abstract
The main objective of this article is to contribute to characterization of little known Quaternary deposits through the analysis of previous research and field observations of its author, taking into account that the deepening of geological knowledge, object of geological cartography at scale 1: 50 000, currently under development, needs to take them into account even when they are not cartographically representable, since they intervene in important events of the history of geological development. They are redish clays present in the marine-coastal territory, which can be lithified or compacted; as well as other chronologically equivalent deposits. The first ones predominate in the raised coasts of the mainland, of the keys and in the seabed, "embedded" in the karst surface of the limestones of the Jaimanitas Formation. The latter are found in the western and southeastern marine platforms, in vicinity of coastal areas, underlaying Holocene friable deposits and covering the weathered surface of limestones of Jaimanitas Formation or of the metamorphic massif from Isla de la Juventud. Taking into account that these data emanate from regional research drilling, it is probable that there are other localities with the same or similar deposits not discovered yet. As main results it was established that: the lithified clays were formed from the decalcification of limestone rocks and the cementation of insoluble iron-rich clay remains, while the compacted ones, constitute alluvial redeposits of similar clays transported from the mainland. In both cases, the process took place during the late Upper Pleistocene, as a consequence of the Wisconsin regression.
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