Meetings & Meeting ReportsSocieties and Academies GEOLOGICAL SOCIETY OF WASHINGTON See allHide authors and affiliations Science 03 Apr 1903:Vol. 17, Issue 431, pp. 541-543DOI: 10.1126/science.17.431.541-a W. C. MendenhallFind this author on Google Scholar Find this author on PubMed Search for this author on this site Article Info & Metrics eLetters PDF This is a PDF-only article. The first page of the PDF of this article appears below.