PALEOZOIC STRATIGRAPHY OF ROCKY MOUNTAINS 375 



Their much greater thickness in Utah may mean that the Devonian 

 submergence proceeded slowly northeastward from that region, or 

 that deposition was more rapid there. 



Pre-Laketown and pre-Devonian emergence. — The base of the 

 Laketown dolomite at Blacksmith Fork is clearly disconformable 

 upon the Fish Haven formation. No evidence of a break between 

 Silurian and Devonian has been noted in that section; and Kindle, 



