Social England : a record of the progress of the people in religion, laws, learning, arts, industry, commerce, science, literature and manners, from the earliest times to the present day . y him in NorthWales, should bear this name, or be designated Lower Silurian—the name given by Murchison to a series in his own regionwhich had since proved to be generally identical with theabove-named portion of Sedgwicks Cambrian, instead of over-lying it, as had been at first sujjposed. The nomenclature,however, was held by Sedgwick to iuvolve a principle. Hemaintained that his Cambrian system was accurat
Social England : a record of the progress of the people in religion, laws, learning, arts, industry, commerce, science, literature and manners, from the earliest times to the present day . y him in NorthWales, should bear this name, or be designated Lower Silurian—the name given by Murchison to a series in his own regionwhich had since proved to be generally identical with theabove-named portion of Sedgwicks Cambrian, instead of over-lying it, as had been at first sujjposed. The nomenclature,however, was held by Sedgwick to iuvolve a principle. Hemaintained that his Cambrian system was accurate from bottomto top, and this contention has been confirmed in its essentialsby all later researches; while his opponent, by confusing the e> GEOLOGY, 1S15-1S4I!. 83 Caradoc and the Upper Llandovery groups, had missed thegreat physical break which split his Silurian system into two,and had left the lower part-- in which also another serious errorhad been detected—without any detinite base. It is now very commonly held that the scientific questionis best solved by recognising three distinct systems—that is, byrestricting the name Silurian to the upper division of Murchison,. SIR RODERICK IIUEY Ml RCllISOX, liV STEPHEN PEARCE. (Xatloilal Portrait (laUrry.) and Cambrian to the lower and middle divisions of Sedgwickssystem, and by conferring a new name, Ordovician, on th(^ ]iartwhich has been the subject of debate. Want of space forbids us to enumerate in detail, though it Post-must not be forgotten, the advances which were being made systems,during all this time in perfecting the work of William Siuilhamong the great masses of stratified rock overlying and includingthe Carboniferous sj^stem. In this task also Sedgwick andMurchison liad taken a share; the fbriner in papers on the lowerpart of the New Red Sandstone (with the Magnesian Limestoneof North-Eastern England), completed in 1828, and in one ondeposits of the same age in parts of Cumberland and Lancashire, 84 PEACE,
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