Note 7 — Chapter III
Reading edition
Some canyon floors, where there is no permanent large stream, appear to have altogether ceased descending. Dutton says of those which drain the Terrace Plateaus: “Many of them are actually filling up, the floods being unable to carry away all the sand and clay which the infrequent rains wash into them.”—Tertiary History, p. 50. See also pp. 196 and 228 Ib.