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THE JOURNAL OF GEOLOGY.

tical gash four or five inches wide, is filled with conglomerate, connecting with the conglomerate below, and tapering irregularly to a point on the upper surface of the exposure. It is clear, as Professor Van Hise has suggested, that the large mass of granite was a partly detached block of the irregular surface upon which the conglomerate was laid down, and that the sedimentary material at A and B has sifted into cracks existing in it at that time.

VI. Summary.

  1. We have near Republic a conglomerate which from its relations must lie at the base of the Lower Huronian, and cannot possibly be Upper Huronian.
  2. This conglomerate rests in visible contact upon granite, and is a basal conglomerate;—i.e., it contains numerous water-worn fragments of the granite upon which it rests.

Henry Lloyd Smyth.

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