In the west central part of Riley county, twenty miles northwest of Manhattan and one mile east of Bala, on the Chicago, Rock Island & Pacific railroad, about 500 feet north of the track, is a small outcrop of a dark green rock which is of great geologic interest, and yet appears to have escaped notice in print until the present time.

Credit for the discovery belongs to Mr. T. S. Harrison, of Denver, who examined the outcrop and recognized its igneous character on a visit in 1919. He reported it to the writers who have made a study of...

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