. 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. m 'â '"'.' Mi \: s-y. '^^^-â-.^f.' CIIAPTKR XXin. THK Ul'I'KK SIMIRIAN. UI'IT-K SIMIIUAN (»K NOVA SCOTIAâOF NKW IIHUNrfWlCK USKFUf- MIN- I:kAI-SâFOSSIL KKMAINSâMKTAMOKl'IIlaM OF SKDIMKNTSâIGNEOUS KOCKS. That enormous mass of soiliincnts constituting tlio Siliiriiin system ot Sir Roderick Murchisou, is by some geologists divided into three portionsâthe
. 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. m 'â '"'.' Mi \: s-y. '^^^-â-.^f.' CIIAPTKR XXin. THK Ul'I'KK SIMIRIAN. UI'IT-K SIMIIUAN (»K NOVA SCOTIAâOF NKW IIHUNrfWlCK USKFUf- MIN- I:kAI-SâFOSSIL KKMAINSâMKTAMOKl'IIlaM OF SKDIMKNTSâIGNEOUS KOCKS. That enormous mass of soiliincnts constituting tlio Siliiriiin system ot Sir Roderick Murchisou, is by some geologists divided into three portionsâthe Upper, Middle, and Lower. As will be seen, however, by reference to the table of geological cycles on [). 137, in North America this great system of formations represents two entire geological cycles, and no more. One of these has been named the Upper and the other the Lower Silurian ; though, in accordance with ordinary geological nomenclature, each of these great groups, co- ordinate in importance with the Devonian and Carboniferous, might have a distinct name. The illustrious author of " Siluria " has not, in his latest edition (1867), claimed for the Silurian rocks this dis- tinction of constituting two systems; but he has recognised the term Primordial, proposed by Barrandc, in so far as to designate the lowest members of the system as " Primordial ; "While, however, the term Silurian as thus held includes two great cycles of the earth's history, the term Primordial is to be understood in a limited sense, since the only truly Primordial rocks arc the Laurentian, or those still older sediments from which the materials of the J^aurentian have been in part derived. Acadia cannot, however, claim to bo a typical region for any of these scries of rocks, presenting them but in limited areas, and so much altered and disturbed, that their arrangement and subdivisions are by no means so clear as in the great inland plains of North Am
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Keywords: ., boo, bookcentury1800, booksubjectgeology, booksubjectpaleontology
