Mr. Deacon's paper seems to me to be an example of the type of computational research which will become more common and more in demand as the reflection seismograph is called upon to solve more and more complicated structural and stratigraphic problems. Probably most of us in reflection seismograph work have noticed and have plotted by routine methods, abnormal wave fronts appearing on our records such as those illustrated in Mr. Deacon's paper. Unfortunately it is seldom that individual study is given to such “reflection” and still more seldom that such individual study is published. Mr. Deacon has collected a rather convincing set of data from which to draw conclusions, although a California operator would wish for more information regarding velocity.

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