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Canto Del Agua Formation
Canto del Agua Formation () is a geological formation in the Atacama Region of northern Chile. Its stratigraphy from top to bottom is as follows: mudstone, limestone, sandstone, mudstone, conglomerate (geology), conglomerate, lapilli tuff, conglomeratic sandstone, muddy sandstone. The environment where the sediments of the formation deposited is thought to have been the "submarine section of a coarse-grained fan delta" with other authors adding that the sedimentary basin where the sediments deposited was "bounded by two normal faults of WNW strike, active during deposition". The exact relationship with the underlying Llano de Chocolate Beds is not clear. In some locations the formation overlaps directly on the Punta de Choros Metamorphic Complex. The type locality (geology), type locality of the formation lies next to the Plomiza mine. References {{Geology of Chile Geologic formations of Chile Triassic System of South America Triassic Chile Sandstone formations Mudstone f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geological Unit
A stratigraphic unit is a volume of rock of identifiable origin and relative age range that is defined by the distinctive and dominant, easily mapped and recognizable petrographic, lithologic or paleontologic features ( facies) that characterize it. Units must be ''mappable'' and ''distinct'' from one another, but the contact need not be particularly distinct. For instance, a unit may be defined by terms such as "when the sandstone component exceeds 75%". Lithostratigraphic units Sequences of sedimentary and volcanic rocks are subdivided on the basis of their shared or associated lithology. Formally identified lithostratigraphic units are structured in a hierarchy of lithostratigraphic rank, higher rank units generally comprising two or more units of lower rank. Going from smaller to larger in rank, the main lithostratigraphic ranks are bed, member, formation, group and supergroup. Formal names of lithostratigraphic units are assigned by geological surveys. Units of forma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |