Abstract
ABSTRACT This investigation was made to determine if heavy minerals could be used to distinguish between the terraces of Colorado River of Texas. The ratio of hornblende to black opaque minerals is very small in the oldest terrace deposits, but this ratio increases rapidly in the deposits of each of the younger terraces. The distinctive mineral ratios found in the various terraces in the vicinity of Austin persist at least as far as Altair in Colorado County, which is located in the flat coastal plain. The terraces remain in the same order throughout this distance and the older terraces are not overlapped by younger ones as has been suggested.
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