RT Journal Article SR Electronic T1 Rocks of the park JF American Journal of Science JO Am J Sci FD American Journal of Science SP 106 DO 10.2475/ajs.s3-25.146.106 VO s3-25 IS 146 A1 Wm. Beam YR 1883 UL http://www.ajsonline.org/content/s3-25/146/106.abstract AB