Scope and Contents Letter to Sir Archibald Geikie from Capt Clarence Edward Dutton discussing the fossiliferous Upper Cambrian metamorphosed sandstone shales found at Lake Superior and the Grand Canyon. At Lake Superior these beds overlie 1400 feet of unfossiliferous sandstone and shale, interspersed with layers of copper bearing metamorphosed volcanic ash. These are the same as the Huronian metamorphic beds at Lake Huron which are possibly of the Lower Cambrian age due to an unconformity (as identified by...

Scope and Contents

Letter to Sir Archibald Geikie from Capt Clarence Edward Dutton expressing regret that he was unable to vacation in Germany and France during the month of October as he had anticipated. He thanks Geikie for his papers on the pre-cambrian, reports that American geologists are also considering this problem and surmises that American exposures of pre-cambrian fosseliferous rocks are more extensive than those in Britain.