Zoltan de Cserna of the Instituto de Geología, Universidad Nacional Antónoma de México, México, D. F., México, has kindly directed our attention to two of his papers which present distributional data and contain thoughts relative to the age and origin of the Huizachal group in northern Mexico. These papers, which were inadvertently omitted from our list of references, should indeed be included and we take this opportunity to direct attention to our oversight and to thank de Cserna for calling our attention to the omission. The first was not available to Mixon and Murray, who prepared the bibliography, until de...

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