This paper describes interpretative problems encountered in four widely scattered areas: Southern Florida; Beaver County, Oklahoma; the Plainview Basin of the Texas Panhandle; and Hancock County, Mississippi.Secondary refraction recordings offer problems, because refractions from deep beds are distorted and obscured by energy from shallow beds. The energy associated with the shallow refractors appears as multiples and is sustained for long periods of time. In Beaver County, Oklahoma, extreme variations in velocity cause distortion of reflections and introduce apparent dips which are erroneous. This velocity variation is thought to be due to differential salt solution from the Blaine-Cimarron interval. In the Plainview Basin of the Texas Panhandle and in Hancock County, Mississippi, multiple reflections are troublesome. These reflections are discussed and records and cross-sections illustrate these events. Some suggestions for the treatment of these problems are advanced.

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