The American Journal of ScienceJ.D. & E.S. Dana, 1921 |
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Стр. 5
... portion covers about 1100 square miles , and whose cover over broad areas consisted merely of a somewhat earlier series of extrusive andesites a few thousand feet in thick- ness . Some folding of the older sedimentary rocks seems to ...
... portion covers about 1100 square miles , and whose cover over broad areas consisted merely of a somewhat earlier series of extrusive andesites a few thousand feet in thick- ness . Some folding of the older sedimentary rocks seems to ...
Стр. 6
... portions now exposed have been uncovered through many cycles of uplift and erosion . It is especially with this group , which is illustrated in the regionally metamorphosed province of New England , and which may be called orogenic ...
... portions now exposed have been uncovered through many cycles of uplift and erosion . It is especially with this group , which is illustrated in the regionally metamorphosed province of New England , and which may be called orogenic ...
Стр. 7
... portion of the quad- rangle . Here a mountain rises to an elevation of 8200 feet , showing no igneous core , but rivalling in elevation the mountains made by the Crazy Mountain stocks and their aureole of metamorphosed sediments . This ...
... portion of the quad- rangle . Here a mountain rises to an elevation of 8200 feet , showing no igneous core , but rivalling in elevation the mountains made by the Crazy Mountain stocks and their aureole of metamorphosed sediments . This ...
Стр. 8
... portion being con- cealed than has become revealed by erosion . Another line of evidence of broader character is ... portions of what is now one of the great plateau regions of the world . Mountain ranges were raised , and crustal ...
... portion being con- cealed than has become revealed by erosion . Another line of evidence of broader character is ... portions of what is now one of the great plateau regions of the world . Mountain ranges were raised , and crustal ...
Стр. 15
... portions , cleavage with dehydration in those portions which are deeper , hotter , and invaded by magmatic ema- nations . The Section across Northwestern Connecticut . The writer has made a study of the geologic section on the northern ...
... portions , cleavage with dehydration in those portions which are deeper , hotter , and invaded by magmatic ema- nations . The Section across Northwestern Connecticut . The writer has made a study of the geologic section on the northern ...
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Ankylosaurus appear armor atoms augite Basin batholithic biotite bone Bull bullæ canine centrum character chemical Chionophila clay cliff Cretaceous crystals deformation Delicias beds deposits depth described developed Devonian diameter Eporeodon erosion evidence fault fauna feet figure folding foramen formation fossils genera genus Geological gneiss granite Hewett Holotype hypocone igneous incisive foramina infra-orbital John Day Jour later lattice layers limestone lower magma malar Marsh material metamorphism miles minerals Mississippian Mountain Muddy Muddy Mountains Nodosaurus occur Oligocene orbit Oreodon orientite oxide Paleozoic Permian plane plates Polacanthus portion posterior postglenoid premolar present probably quartz quartzite region ribs ridges River rocks sagittal crest sandstone schists sediments shale skull space groups species specimens Stegosaurus strata structure superior molars surface Survey terraces thick thin tion U. S. Geol unconformity upper valley vertebræ width Windsor zone zygoma