Letters Synchronism of geological formations By ANGELO HEILPRIN See allHide authors and affiliations Science 21 Dec 1883:Vol. ns-2, Issue 46, pp. 794-795DOI: 10.1126/science.ns-2.46.794-b ANGELO HEILPRIN Find 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 above.