RT Journal Article SR Electronic T1 Hillocks of angular gravel and disturbed stratification JF American Journal of Science JO Am J Sci FD American Journal of Science SP 378 OP 390 DO 10.2475/ajs.s3-27.161.378 VO s3-27 IS 161 A1 Thomas Chrowder Chamberlin YR 1884 UL http://www.ajsonline.org/content/s3-27/161/378.abstract AB