. Acadian geology [microform] : the geological structure, organic remains and mineral resources of Nova Scotia, New Brunswick and Prince Edward Island. Geology; Paleontology; Geology; Geology; Geologie; Paléontologie; Géologie; Géologie. 4 1'. ,: ' â -; â ID' :t 1 ' 1 â i'H ' !â ' i:^'^ â i ri ..! t. 'â ; I 1 i i ^m "« fiOO THE DEVONIAN PERIOD. This junction is of great interest, as showing the gradual alteration of slaty beds holding fossils into gnoissose rock with garnets, within the distance in some places of a few hundred feet. It is observable also, that while the gneiss graduat
. Acadian geology [microform] : the geological structure, organic remains and mineral resources of Nova Scotia, New Brunswick and Prince Edward Island. Geology; Paleontology; Geology; Geology; Geologie; Paléontologie; Géologie; Géologie. 4 1'. ,: ' â -; â ID' :t 1 ' 1 â i'H ' !â ' i:^'^ â i ri ..! t. 'â ; I 1 i i ^m "« fiOO THE DEVONIAN PERIOD. This junction is of great interest, as showing the gradual alteration of slaty beds holding fossils into gnoissose rock with garnets, within the distance in some places of a few hundred feet. It is observable also, that while the gneiss graduates into the slate it does not pass imperceptibly into the granite, but presents a distinct line of separation, marking the limit of the Plutonic and Metamorphic rocks, and indi- cating that the granite was truly a heated mass intruded among the aqueous deposits (Fig. 177). Farther, liS the granite is itself of Fig. 177.âJunction of Granite and Devonian Slate, Nictaux. V »,».«.. (a) Granite. (b) Slate with gncissose character, in fragments imbedded in the granite. Devonian age, we learn that no great interval of geological time elapsed between the deposition and the metamorphism of the beds. Again, as the granite cannot be a superficial or surface rock, there must have been a mass of upper Devonian rocks swept away by denudation to expose the beds as at present. Lastly, though the beds are inclined at high angles, they run against the granite in their line of strike in such a manner as to show that it cuts quietly through them, without any great evidence of mechanical distui'bance in con- nexion with its eruption, and it would appear that the general direction of dip is toward the granitic mass, as if the Devonian and Upper Silurian beds had sunk into a caldron of molten granite. Further exploration of the country southward of Nictaux will be necessary before we understand in detail the relation of the Devonian rocks to the great masses of granite which a
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Keywords: ., boo, bookcentury1800, booksubjectgeology, booksubjectpaleontology
