—, —, ranges of, through western Massachusetts, viii, 13, 28.
—, —, ibid, alternation with mica slate, viii, 15.
—, —, of the Connecticut valley, vi, 37; viii, 240.
—, —, ibid, alternating with mica slate, viii, 240.
—, of Connecticut, at Salisbury, viii, 240.
—, —, of New York, v, 266.
—, —, of Pennsylvania, v, 41.
—, —, &c., near Hudson's Bay, xvii, 13.
—, —, of Maryland, fossils in, xxvi, 222.
—, granular, of New Jersey, minerals of, v, 239.