U.S. Geological Survey Professional PaperU.S. Government Printing Office, 1902 |
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20 feet adjacent Agiapuk Alaska altered argillites bed rock belt body calcite carry chalcopyrite chiefly chloritic claim claim.-This copper pyrite country rock Creek deposits Devonian diabase dikes diorite Ear Mountain east exposed foliation fossils gangue geology Glacier Bay gold values Grantley Harbor graphitic gravel Gravina Island greenstone greenstone-schist igneous rocks inches Inlet intrusive iron pyrite Ketchikan Ketchikan district Ketchikan series Kigluaik Kugruk River Kuzitrin River Kuzitrin series limestone localities located lowland Mesozoic metamorphism mica-schists miles mineralized zone mining northern Noxapaga Nuluk occur outcrop Paleozoic phyllites placer Port Clarence Port Clarence limestone Prince of Wales probably prospectors quartz quartz veins Reconnaissances reported schist schistose Seward Peninsula shaft Silurian slates southeastern Alaska southern strike surface thickness tide water tributaries tunnel U. S. Geol upper Vallenar valley Wales Island Wales series white crystalline limestone width writer York Mountains York Plateau
Beliebte Passagen
Seite 48 - Reconnaissances in the Cape Nome and Norton Bay regions, Alaska, in 1900,
Seite 70 - Emerson. 1899. 139 pp., 9 pis. B 165. Contributions to the geology of Maine, by HS Williams and HE Gregory.
Seite 32 - Island, is a lake about a mile long and a quarter of a mile broad, which is entirely surrounded by a rock rim.
Seite 12 - The two latter lie without the region under discussion, and will not be further considered. The so-called Coast range extends from near the boundary of Washington northward through British Columbia into southeastern Alaska. In British Columbia it has a width of about 100 miles, which decreases to the northward.
Seite 20 - ... several of the main subdivisions of the geological scale. In so far as the information obtained in the region here in question enables conclusions on the subject to be formed, the lowest part of the rocks, (1) consists of greenish and gray schists generally...
Seite 20 - Palaeozoic rocks of very varied region ^ appearance, and probably referable to several of the main subdivisions of the geological scale. In so far as the information obtained in the region here in question enables conclusions on the subject to be formed, the lowest part of the rocks, (1) consists of greenish and...
Seite 36 - The indications on the surface are that Prince of Wales island contains much mineral. Gold, both free milling and in sulphurets, silver, galena, copper, and iron have been found in many places, but as yet no extensive efforts have been made to demonstrate whether any of the ores mentioned exist in paying quantities. If minerals exist in other portions of the district the very limited prospecting done has failed to show it. Annette island may be an exception, and also Dall island. Some of the finest...
Seite 25 - In a previous report f the writer grouped the Carboniferous and Devonian beds of the upper White and Tanana rivers together under the name Nutzotin series. This Nutzotin series would in a measure correspond to the subdivision called Upper Paleozoic on the accompanying map, but will probably also embrace a part, at least, of the argillites which lie adjacent to the Coast range. In the report cited the limestones of Glacier bay were all put in the Nutzotin series, as they were then believed to be Carboniferous.
Seite 26 - ... black slates. The Kennicott series, however, in the Copper river of Jura-Cretaceous age is made up of fragmental rocks similar in character to the Mesozoic of southeastern Alaska. The Tertiary sediments of southeastern Alaska are chiefly Kenai, and this horizon has been identified in many parts of Alaska. Dawson's last investigation * on the geology of this northern region is a report on the Kamaloop district in southern British Columbia.
Seite 44 - Geological Record of the Rocky Mountain Region in Canada: Bull. Geol. Soc. of Am., vol.