“…These zero-or low-amplitude notches between the amplitude bands indicate that even a two-interface sequence such as a thin layer will inherently be missing certain frequencies. Geologic sequences with more than two interfaces will have more complex spectral signatures that must be examined case-by-case (e.g., Berzon, 1969;Khattri and Gir, 1976;Khattri et al, 1979;Bilgeri and Carlini, 1981;Walden and Kosken, 1985;Gochioco, 1992).…”