Regional Geology of the United States of North America
Regional Geology of the United States of North America
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General. The rocks of the Basin Ranges represent nearly all ages from Archean to modern. The oldest terranes are not widely exposed nor as yet well understood. They are believed to be partly Archeozoic and partly Proterozoic. The prevailing rocks are limestones, quartzites and shales of Paleozoic age associated wilh vast quantities of much younger intrusiv and extrusiv igneous rocks. The ranges are swathed in more recent Tertiary and Quaternary deposits.
Ancient Schistose Formations. Here and t...here beneath the unaltered Paleozoic sediments there are ancient gneisses, schists, and granitic intrusivs. In Utah these are clearly older than the late Proterozoic, and have been generally referred to the Archean. In Arizona and other southeastern districts the schistose terranes are also clearly pre-Cambrian, altho beside gneiss and granite they contain much sedi- mentary material and for that reason have been considered partly Algonkian. In the western part of the Basin Ranges, the correlation of the metamorphosed terranes is more difficult because of the intense post-Jurassic diatrophism.
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To quickly assess the difficulty of the text, read a short excerpt:
General. The rocks of the Basin Ranges represent nearly all ages from Archean to modern. The oldest terranes are not widely exposed nor as yet well understood. They are believed to be partly Archeozoic and partly Proterozoic. The prevailing rocks are limestones, quartzites and shales of Paleozoic age associated wilh vast quantities of much younger intrusiv and extrusiv igneous rocks. The ranges are swathed in more recent Tertiary and Quaternary deposits.
Ancient Schistose Formations. Here and t...here beneath the unaltered Paleozoic sediments there are ancient gneisses, schists, and granitic intrusivs. In Utah these are clearly older than the late Proterozoic, and have been generally referred to the Archean. In Arizona and other southeastern districts the schistose terranes are also clearly pre-Cambrian, altho beside gneiss and granite they contain much sedi- mentary material and for that reason have been considered partly Algonkian. In the western part of the Basin Ranges, the correlation of the metamorphosed terranes is more difficult because of the intense post-Jurassic diatrophism.
What to read after Regional Geology of the United States of North America?
You can find similar books in the "Read Also" column, or choose other free books by Eliot Blackwelder to read onlineMoreLess
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