“…A very low (to negative) sedimentation rate in the genetic environment is considered essential (e.g., Van Andel and Postma, 1954;Cloud, 1955;Burst, 1958b;McRae, 1972), and water depths equivalent to the neritic environment (immediately sublittoral to the upper part of the continental slope) are generally inferred (see McRae, 1972). A periodically agitated low energy environment appears to be necessary (Van Andel and Postma, 1954;McRae, 1972;Odin, 1975), but in many occurrences, current generated structures probably reflect reworking after the glauconite was formed (e.g., Ward and Lewis, 1975;McConchie, 1978;McConchie and Lewis, 1978). A pH of 7 to 8 (Fairbridge, 1967) and slightly reducing conditions (Eh < 0) are generally considered to be the most favorable (Cloud, 1955;Burst, 1958a;Fairbridge, 1967), although the reducing conditions may be confined to the immediate vicinity of the proto-glauconite (Burst, 1958a;Norris, 1964), while the overall conditions remain slightly oxidizing (Van Andel and Postma, 1954).…”