Английская Википедия:Casma Group
Шаблон:Infobox rockunit The Casma Group (Шаблон:Lang-es) is a stratigraphic group of Cretaceous (Albian to Cenomanian) sedimentary formations exposed along the coast and within the Cordillera Occidental near Casma, Peru.
Description
The sediments of the Casma Group reflect deposition in two distinct environments of the West Peruvian Basin. Some sediments were deposited near the Casma Volcanic Arc in an intra-cratonic sedimentary basin that was occasionally connected to the ocean. Other sediments were deposited in what was once a continental platform bounded by reefs and with anoxic pockets.[1]
Together with the Morro Solar and Imperial Groups, the Casma Group contains clastic volcanosedimentary material derivative of the Mesozoic Casma Volcanic Arc.[2] The folding of the Casma Group sediments is the result of the Cretaceous Mochica Phase of the Andean orogeny.[2] The group is intruded by plutons of the Coastal Batholith of Peru.[2]
The Casma Group include the following lithologies: gypsum, limestone, marl, tuff, lava flows, sandstone and conglomerate.[1]
References
Bibliography
Шаблон:Major South American geological formations
- Английская Википедия
- Geologic groups of South America
- Geologic formations of Peru
- Lower Cretaceous Series of South America
- Upper Cretaceous Series of South America
- Cretaceous Peru
- Cretaceous volcanism
- Albian Stage
- Cenomanian Stage
- Limestone formations
- Marl formations
- Sandstone formations
- Conglomerate formations
- Tuff formations
- Geography of Ancash Region
- Geography of Lima Region
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- Страницы с телепортом
- Википедия
- Статья из Википедии
- Статья из Английской Википедии
