RT Journal Article SR Electronic T1 Cretaceous metamorphic rocks of California JF American Journal of Science JO Am J Sci FD American Journal of Science SP 348 OP 357 DO 10.2475/ajs.s3-31.185.348 VO s3-31 IS 185 A1 George Ferdinand Becker YR 1886 UL http://www.ajsonline.org/content/s3-31/185/348.abstract AB