Report on the Geology and Topography of a Portion of the Lake Superior Land District in the State of Michigan: The iron region, together with the general geologyHouse of Reps., 1851 |
Dentro del libro
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Página xiv
... surface enlarged . " Fragments of the branching form of this species , show- ing the nodose character in different degrees . c . SCHIZOCRINUS NODOSus - columns . XXVI . PAGE 209 . Fig . 1 . 1 a . 16 . 1 c . XXVII . PAGE 210 . Fig . 1 ...
... surface enlarged . " Fragments of the branching form of this species , show- ing the nodose character in different degrees . c . SCHIZOCRINUS NODOSus - columns . XXVI . PAGE 209 . Fig . 1 . 1 a . 16 . 1 c . XXVII . PAGE 210 . Fig . 1 ...
Página 9
... surface being chiefly due to such a loss of its origi- nal heat by long - continued radiation into the surrounding space , that , from having been wholly gaseous , then fluid and gaseous , and subsequently solid , fluid and gaseous ...
... surface being chiefly due to such a loss of its origi- nal heat by long - continued radiation into the surrounding space , that , from having been wholly gaseous , then fluid and gaseous , and subsequently solid , fluid and gaseous ...
Página 16
... surface , so that much of the mass is comparatively worthless ; but it is believed that the blocks taken from a greater depth , and beyond the action of atmospheric agents , will be free from these imperfections . Messrs . Smith & Pratt ...
... surface , so that much of the mass is comparatively worthless ; but it is believed that the blocks taken from a greater depth , and beyond the action of atmospheric agents , will be free from these imperfections . Messrs . Smith & Pratt ...
Página 18
... surface is smoothed and striated in a wonderful manner . Below the mouth of Dead river , a highly crys- talline mass of this character emerges in the form of an island fifty or sixty feet in height . The main Presqu'isle consists of a ...
... surface is smoothed and striated in a wonderful manner . Below the mouth of Dead river , a highly crys- talline mass of this character emerges in the form of an island fifty or sixty feet in height . The main Presqu'isle consists of a ...
Página 20
... surface , or by low ledges in the beds of rills . As we approach the granite axis , the detrital rocks become more crystalline and exhibit in a more marked degree the effects of metamorphism . About a mile and a half south of the line ...
... surface , or by low ledges in the beds of rills . As we approach the granite axis , the detrital rocks become more crystalline and exhibit in a more marked degree the effects of metamorphism . About a mile and a half south of the line ...
Otras ediciones - Ver todas
Report on the Geology and Topography of a Portion of the Lake Superior Land ... John Wells Foster,Josiah Dwight Whitney Sin vista previa disponible - 2016 |
Términos y frases comunes
appear azoic Bay des Noquets beaches beds belt calcareous calciferous sandstone carbonate carboniferous Carp river character chlorite cliffs Clinton group coast color conglomerate copper correction line crystalline crystals deposits Devonian distance district drift dunes east elevation Escanaba Escanaba river extending feldspar fossils geological granite Green Bay height hornblende Hudson-river group hundred feet Huron igneous igneous rocks inches island Isle Royale Keweenaw Point Lake Huron Lake Michigan Lake Superior layers lime limestone lower Silurian Mackinac magnesia magnetic mass Menomonee Menomonee river meridian miles mineral nearly Niagara group northern numerous observed occur Onondaga oxide pebbles peroxide of iron Plate portion Potsdam Potsdam sandstone quartz range region ridges rise river sand seen shale shaly shore of Lake silica silicious slates south-west species specimens strata stratified striæ surface terraces thickness tion township trace trap trappean rocks Trenton limestone upper Helderberg veins York