Letters Fluidal cavities in quartz-grains of sandstones See allHide authors and affiliations Science 30 Mar 1883:Vol. ns-1, Issue 8, pp. 221DOI: 10.1126/science.ns-1.8.221-a G. P. MERRILLFind 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.