. Bulletin of the Geological Society of America. Geology. MIDDLE JURASSIC 327 These strata of Middle Jurassic age are divided into two series, sepa- rated by a pronounced unconformity. The lower series will be described 20 miles ^^ Tertiary sandstones, Jurassic volcanics. State-schist series GranitFc rocks with shales,and conglomerate sandstones,shales, with intrusive granite areas of volcanics locally carrying coal and conglomerate, loca'ty carrying coal Figure 1.—Geologic Hup of Region Xoi-thcast of Cook Inlet, Alaska. Greenstones- and related pyroclastics constitute the most charact
. Bulletin of the Geological Society of America. Geology. MIDDLE JURASSIC 327 These strata of Middle Jurassic age are divided into two series, sepa- rated by a pronounced unconformity. The lower series will be described 20 miles ^^ Tertiary sandstones, Jurassic volcanics. State-schist series GranitFc rocks with shales,and conglomerate sandstones,shales, with intrusive granite areas of volcanics locally carrying coal and conglomerate, loca'ty carrying coal Figure 1.—Geologic Hup of Region Xoi-thcast of Cook Inlet, Alaska. Greenstones- and related pyroclastics constitute the most characteristic portion of these rocks. Tuffs, agglomerates, and flow breccias form the great bulk of the greenstones, and intercalated flows of coarse amygdaloid are of frequent occurrence. Examination in thin-section shows that the greenstones and their ejectamenta are andesites of hyalopilitic and pilo- \axitic textures, more or less thoroughly chloritized,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Geological Society of America. [New York : The Society]
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