Nomenclature of Precambrian Rocks in Colorado
Description:
Abstract: "The Precambrian rocks of Colorado consist of a metaphoric complex more than 1,700 million years in age, three groups of igneous rocks about 1,700, 1,400, and 1,000 million years in age, here designated informal age groups, and two areally restricted units of sedimentary rocks, one between 1,400 and 1,700 million years in age and one between 950 and 1,400 million years. A systematic nomenclature for many of the rocks does not exist, but the present state of knowledge will permit estab…
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Date:
1977
Creator:
Tweto, Ogden
Item Type:
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Report
Partner:
UNT Libraries Government Documents Department