VI. 



GENERA OF FOSSILS. 



75 



The system of life here sketched in bare outline was brought 

 to light in 1831 and subsequent years by Sir R. I. Murchison 

 and Professor Sedgwick, earnestly labouring in Wales and the 

 bordering counties. It is now recognized at various points on the 

 globe, and often fills large tracts in widely-separated regions, thus 

 affording a general basis for a universal classification of fossiliferous 

 strata in the order of time. 



