Bulletin, 325-329. sayılarU.S. Government Printing Office, 1949 |
Kitabın içinden
100 sonuçtan 1-5 arası sonuçlar
Sayfa 10
... schists . The garnetiferous mica schist is composed largely of quartz , which shows powerful strain shadows , muscovite in long laths , chloritized biotite , orthoclase , and garnet altered almost com- pletely to chlorite . In the albite ...
... schists . The garnetiferous mica schist is composed largely of quartz , which shows powerful strain shadows , muscovite in long laths , chloritized biotite , orthoclase , and garnet altered almost com- pletely to chlorite . In the albite ...
Sayfa 11
... schist series . The pyroxenite presents a pseudoporphyritic aspect under the microscope , due to crushed plates of ... schists . The strike of the schistosity varies from N. 45 ° E. to N. 60 ° W. The dips average near 40 ° , but are ...
... schist series . The pyroxenite presents a pseudoporphyritic aspect under the microscope , due to crushed plates of ... schists . The strike of the schistosity varies from N. 45 ° E. to N. 60 ° W. The dips average near 40 ° , but are ...
Sayfa 12
... schist has a considerable areal distribution along the lower course of Talkeetna River . In that region they show ... schists ; that is , schists that are so fine - grained that their constituents are not recognizable by the unaided eye ...
... schist has a considerable areal distribution along the lower course of Talkeetna River . In that region they show ... schists ; that is , schists that are so fine - grained that their constituents are not recognizable by the unaided eye ...
Sayfa 32
... schists and their isolated occurrence as a single narrow belt indicate the completeness of the geologic revolution which the region has undergone since their formation . On the basis of petrographic similarity these schists are ...
... schists and their isolated occurrence as a single narrow belt indicate the completeness of the geologic revolution which the region has undergone since their formation . On the basis of petrographic similarity these schists are ...
Sayfa 64
... schist . It is closely folded and infiltrated with fine quartz stringers . The only produc- tive placer thus far developed within the region is situated on this belt of schists . It is noteworthy that the igneous rocks , granitic and ...
... schist . It is closely folded and infiltrated with fine quartz stringers . The only produc- tive placer thus far developed within the region is situated on this belt of schists . It is noteworthy that the igneous rocks , granitic and ...
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Sık kullanılan terimler ve kelime öbekleri
Alaska Arkansas auriferous average basin beach beam bed rock bench Bendeleben Mountains boiler efficiency bowlders Cape Nome carbon cent Chickaloon chloritic clay clinker coal bed coal field coastal plain Collier combustion-chamber temperature creek bed curve deposits district ditch Drill hole dry coal east efficiency 72 fault feet thick formation Fort Smith fossils furnace Geological Survey geology granite gravel greenstone Gulch Hartshorne hydrogen inches Kigluaik Kigluaik Mountains Kougarok limestone lower Matanuska Matanuska River material miles mineral mining Mountains mouth Neuropteris Niukluk River Nome group Norton Bay Norton Bay regions Number of tests Ophir Creek outcrop pay streak placer gold Port Clarence pound of combustible pounds of dry probably quartz ratio reconnaissance reported River sample sand sandstone schist Seward Peninsula shaft Shale Shale roof shows slope Spadra stream surface tion tributary U. S. Geol upper valley veins
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