Publisher © Czech Geological Survey, ISSN: 2336-5757 (online), 0514-8057 (print)
Sediments of tectonically pre-disposed basins in E part of El Salvador
Abstract
Tectonically predisposed depressions are filled with sediments of differents particle size distribution: clay, silts, sands, and gravels are present. The total thickness of the complex reaches more than 5 m. The sediments represent weathered material of andesite and of pyroclastics redeposited by washing down into the water-basin. In places white tuff of rhyolite composition overlies the complex deposited most probably as distal sediments during the eruption of the Ilopango caldera. Deposition in the water basin is suggested by the positively graded bedding of the sediment. The pollen analyses of humic clayey loam sediments gives a picture of vegetation around the basin.
