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In June, 1941, William Hilseweck of the Gulf Oil Corporation of Fort Worth, Texas, sent the writer a piece of core from a well taken at a depth of 9,340 feet in Crane County, Texas. While he did not determine the species, he correctly concluded that the graptolites on the core proved the presence of a Silurian zone for one which had commonly been called Devonian. A few fragments of graptolites occur on the surface of the core, but they have sufficiently diagnostic characteristics to identify the species. The stratigraphic conditions are noted, and the species is illustrated and described. Also, it is compared with specimens of the same species which were sent to the writer from the Chicago region by Alfred and Helen Loeblich.
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