Geologic Reconnaissance in the Matanuska and Talkeetna Basins, AlaskaU.S. Government Printing Office, 1907 - 71 sayfa |
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100 sonuçtan 1-5 arası sonuçlar
Sayfa 9
... thickness . These volcanics are conformably overlain by several thousand feet of sandstones , shales , and ... thick beds of bituminous coal . These coal beds are limited to the lower basin of Matanuska River . A series of post ...
... thickness . These volcanics are conformably overlain by several thousand feet of sandstones , shales , and ... thick beds of bituminous coal . These coal beds are limited to the lower basin of Matanuska River . A series of post ...
Sayfa 12
... thick , reticulating the exposed surface of the series with considerable intricacy . Such seams often show mineralization with sulphide of iron . The work of the season of 1906 showed that a series of rocks similar to the Susitna slate ...
... thick , reticulating the exposed surface of the series with considerable intricacy . Such seams often show mineralization with sulphide of iron . The work of the season of 1906 showed that a series of rocks similar to the Susitna slate ...
Sayfa 13
... thickness . Mineralization of the quartz is not visible to the eye . In the Sunrise district , however , free gold is found ... thick , was found associated with the graywackes . They are dense , fine - grained rocks of green color , con ...
... thickness . Mineralization of the quartz is not visible to the eye . In the Sunrise district , however , free gold is found ... thick , was found associated with the graywackes . They are dense , fine - grained rocks of green color , con ...
Sayfa 17
... thickness of the greenstones often exceeds 1,000 feet . The tuffs locally contain fragments of lignite , and at the ... thick , scattered through it . The microscope shows that these bands are composed of microspherulitic particles and ...
... thickness of the greenstones often exceeds 1,000 feet . The tuffs locally contain fragments of lignite , and at the ... thick , scattered through it . The microscope shows that these bands are composed of microspherulitic particles and ...
Sayfa 18
... thick is revealed . It consists of various porphyries and white quartz peb- bles embedded in a gritty , coherent matrix . A noteworthy feature of this conglomerate is the abundance of pebbles that show indi- vidual faulting . STRUCTURE ...
... thick is revealed . It consists of various porphyries and white quartz peb- bles embedded in a gritty , coherent matrix . A noteworthy feature of this conglomerate is the abundance of pebbles that show indi- vidual faulting . STRUCTURE ...
Sık kullanılan terimler ve kelime öbekleri
Alaska andesite Anvil Creek basin beach beam bed rock bench Bendeleben Mountains bowlders Brooks Bull Cape Nome cement cent channel Chickaloon Chickaloon Creek chloritic claims clay coal coarse coastal plain Collier concrete conglomerate contain creek bed district ditch east elevation erosion feet thick Geological Survey geology Glacier gold placers granite graphitic gravel greenstone Gulch inches intrusive Iron Creek Jurassic Kenai Kigluaik Mountains Knik Knik River Kougarok Kuzitrin Kuzitrin River limestone lower Matanuska Matanuska River material mica schist miles mineral mining Moffit mouth muck Niukluk Niukluk River Nome and Norton Nome group Nome River Norton Bay Norton Bay regions nuggets occur Ophir Creek pay streak pebbles placer gold Port Clarence probably reconnaissance reported sand sandstones schist Seward Peninsula Shale slates slopes sluice boxes special publication stream surface Susitna Talkeetna Mountains test pieces tributary U. S. Geol upper valley
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