Excerpt from Bulletin of the Museum of Comparative Zoölogy at Harvard College, in Cambridge, Vol. 28
On the whole, however, the number of organic remains is few, and the massive silica greatly in excess. When viewed with high power of microscope, this massive portion appears ... often to consist of aggregations of minute granules varying in color from brown to almost colorless. Dr. Hinde 1 found the same true in cherts of the Greensand, and speaks of the granules as having circular outlines, though not strictly a spherical form. Chalcedonic masses with their characteristic concentric structure are common in some of the nodules and rare in others. Many traces of organisms, the outlines of which were but dimly shown, were not made out but those determined were of the groups given below.
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