236 
the large thick layers held by 
of evolution ceases on the formation of d ts prese rved 
1 21 . Iron-ore is being darly deposited, m the shape oi 8^ 
beneath thin coverings ofmossormud. and in 
irregular beds or lu “P s Tt ■ deposit from water holding 
frt^“by f carbonic 
T ts: re d h rs 
»'“^irsrMcSr»4'* ^ 
whether depotited by the wet “J;** ^°“ '*£ g '?hem in 
modern operations are „ toTbSe have been P in all geologica! 
ancient exhibitions, bo, too, tn , , tPe palaeozoic 
ages some deposits of metalhc "fi ^ of action, 
epoch was the chief time of t e isp 7 impossible to overlook 
The work may be now going , „„ r . n v 1 lp of being permeated 
the difference. The rocks are now as capable ot being P 
5S2SWi 
derived from another record, without any feai of 
tion to the contrary. 
