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Show : 880 years but geologists think it is very recent . If ( there- there ) were trees growing on it you might get an idea of its minimum age . There were box elder trees six or eight inches in diameter right close to it but none that were actually growing on the slide . In going up the stream they camped right at the edge of the slide ; they had no tent and just slept on the sand . ( The The' The ) next day [ August 7th ] they went from the slide up to Mile 22 , grounding a few times ; he does not remember the specific places , but he has a record that it required nine ( hours'time hourstime ) , the distance being twenty miles . ( R . 3928-3929 . ) The work which he was doing did not require that ( he be ) stop to get out of the boat except to keep the boat going , because the tops of the rocks in all that part of the valley are low and rise so gently upstream that . you see them for miles , and nothing is covered . His work up and down the river did not engage his attention as much as it interfered with the operation of the boat ; he could look around and see that the strata were the same for long distances back and ahead . Mr . Turpin attended to the engine and . watched the river quite closely , as did he , too , looking from the river to the walls and back again , . The next day , August 8th , they went from Mile 22 to Mile 38 , a distance of twelve miles . . They got a late start , because of making a collection of fossils at Mile 22 . ( R . 3930 . ) They knew they were at those particular miles because they had a map of the Grand River , and the topography of the bank and side ( can- can ) |