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THE DISTRIBUTION OF ANCIENT VOLCANIC ROCKS.
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of an argillaceous or chloritic base, containing angular chert fragments of all sizes up to two feet. He mentions many localities

Fig. 2.Sketch map of parts of Chatham and Orange counties, N. C., showing localities for ancient volcanic rocks.

for these rocks, most of which are near the Yadkin river in Davidson, Rowan and Montgomery counties.

I am informed by Mr. Arthur Keith that he discovered a

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