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Description of a new formation of Cretaceous age in central Colorado.
A reconnaissance study carried out in conjunction with regional geologic mapping.
Granodiorite from the PILE DRIVER experiment was tested for dynamic unconfined compressive strength using a rapid-loading technique. The specimens were loaded to failure using a drop tower, a loading rate of 10,000,000 psi per second, and rise times of from 2.5 to 3.5 milliseconds. Several other specimens were loaded to failure statically at a loading rate of 3000 psi per minute. The granodiorite had an unconfined compressive strength approximately 27 percent greater, a modulus of elasticity approximately 28 percent greater, and a Poisson's ratio approximately 50 percent less when dynamically loaded than when statically loaded. (Author).