. British Antarctic expedition, 1907-9, under the command of Shackleton : reports on the scientific investigations ; geology. fa, 3, -OIJ. *- ; ?-. ,o - 01 - ^ CO C/J * ~ UJ u t- I ui - u o 5 z h- ?J -- zyo ; M - o 0 ^^ :/ w a.) ^ HJ ?M c fa o fa .s c 2i ffi ? (-H ^p^ fa ^^ h—1 cS Pi ?3 $ ^ ^ S fl fa H<< P Q Pi fa 2; llfa cc S § hJ Pi .= § <l o s=- o o o ^H a s — O o M fa p fa OLDER MORAINES OF ROSS ISLAND 263 On the other hand, the erratics, foreign to Ross Island, of granite, gneiss, micaschist, quartzite, quartz- and fels^mr-porphyry, are mostly in the form of small roundpebbl
. British Antarctic expedition, 1907-9, under the command of Shackleton : reports on the scientific investigations ; geology. fa, 3, -OIJ. *- ; ?-. ,o - 01 - ^ CO C/J * ~ UJ u t- I ui - u o 5 z h- ?J -- zyo ; M - o 0 ^^ :/ w a.) ^ HJ ?M c fa o fa .s c 2i ffi ? (-H ^p^ fa ^^ h—1 cS Pi ?3 $ ^ ^ S fl fa H<< P Q Pi fa 2; llfa cc S § hJ Pi .= § <l o s=- o o o ^H a s — O o M fa p fa OLDER MORAINES OF ROSS ISLAND 263 On the other hand, the erratics, foreign to Ross Island, of granite, gneiss, micaschist, quartzite, quartz- and fels^mr-porphyry, are mostly in the form of small roundpebbles, just like water-worn pebbles, from an inch up to about 6 inches in one meets with larger blocks, chiefly of granite, up to from 3 to 5 tonsin weight. These are usually intensely smoothed, and in some cases exhibit groovingon their under surfaces. This was noticeably the case just north of Backdoor Bay, Cape Royds. Graniteeriatics could be seen there, close to Flagstaft Point, at depths of 10 to 20 feet belowsea-level; the intense rounding which the granite blocks at these lower levels hadundergone
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Keywords: ., boo, bookcentury1900, booksubjectgeology, booksubjectpaleontology
