232 J. W. Dawson on the Fossils of the Laurentian. 
ilton and Chemung groups in the Devonian; or to that of the 
Lower Carboniferous conglomerates and sandstones, the C 
period. This recurrence of cycles of deposit cannot be 
dental. It is more or less to rah seen shronghont the geological 
scale, and in all countries; and, as I have elsewhere pointed out, 
it includes numerous subordinate cycles within the same forma- 
tion, as in the coal measures. Eaton, Hunt, and Dana have called 
even 
ore precise views of the dynamics of gee 
oe Se ae ort ng mo 
___ 98Y and of the lapse of geological time. ‘The progress of the 
i 
ee 
Mee St yes 
ARSE Eo PN Oe ee ee ee 
