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ACKNOWLE IXHllUlTS
The writer is greatly indebted to Proteasors
Richard H. Jahns and Robert P. Sharp ot the Calif'ornia
Institute ot Teohnoloa tor their help and oounse1 given
in the otrice. and on several trips into the t1eld.
'Mucth'.:1benet1t was derived tram dlaousalons with assoo1ated
students, eepeo1ally R;J. JlaoNeill and J.P. Lance. So
many debates oonoerning the geomorph1c teatures displayed
in the region were held with E.M. Shoemaker that, despite
every ef'f"ort to the oontrary-,. 1t has been impossible to
divorce his ideas entirely from those of the writer.
