A well drilled in Woodson County, Kansas, about 3 miles southeast of the outcrop of the granite porphyry intrusive of the Rose dome, penetrated a black rock through a thickness of 102 feet, or from the depth of 1,151 to 1,253 feet. This black rock is identified as a peridotite, as it is largely composed of olivine, brown mica, and a fine-grained brown aggregate which does not extinguish between crossed nicols. There seems to be no quartz or feldspar. It is suggested that the black rock is a dike or an intrusive sheet and connected in some way with the Rose dome intrusive.

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