RT Journal Article SR Electronic T1 Some of the features of nonvolcanic igneous ejections, as illustrated in the four "Rocks" of the New Haven region, West Rock, Pine Rock, Mill Rock, and East Rock JF American Journal of Science JO Am J Sci FD American Journal of Science SP 79 OP 110 DO 10.2475/ajs.s3-42.248.79 VO s3-42 IS 248 A1 James Dwight Dana YR 1891 UL http://www.ajsonline.org/content/s3-42/248/79.abstract AB