Numerous types of sandstone bodies encountered in the subsurface have two characteristics in common — they are elongate and lenticular in cross section. These characteristics apply to sandstones resulting from fringing-beach, offshore-bar, chenier, strike-valley, sand-wave, tidal-current, and channel deposition, as well as to some turbidites and some component parts of deltas. Of all these types of sandstone, the channel type is very unusual in that it commonly is deposited subaerially and thus can be observed and studied more readily on the surface. In recent years, many pertinent papers dealing with outcropping ancient channel sandstones have been published. The reader is referred particularly to the following authors for basic information: Fisk (1944), Wilson (1948), Lins (1950), Siever (1951), Pepper et al. (1954), Hopkins (1958), Friedman (1960), Schlee and Moench (1961), Andresen (1961, 1962), Potter (1962a), Potter and Pettijohn (1963), and Bernard and Major (1963).