DIVISIONS OF GEOLOGICAL TIME 



39' 



6. UPPER PALAEOZOIC ZONES. 



The zoning of the Upper Palaeozoic rocks is in a much less 

 satisfactory state than that of either the Lower Palaeozoic or the 

 Mesozoic. Professor Freeh, of Breslau, in 1898, proposed a number 

 of broad goniatite-zones (rather stages than zones, really) for the 

 Devonian system, and Professor Haug, of Paris, did the same for 

 the Carboniferous and Permian. These zones, as modified by 

 Professor Haug in his Traite de Geologic (1911), are here given : 



