. British Antarctic expedition, 1907-9, under the command of Shackleton : reports on the scientific investigations ; geology. 0 I 11 I I I I I 11 I I INCHESOl 234-66789 lO lll ! I I i i i I CENTIMETERS Fig. 1. PECTEX COLBECKI, ^EALS? ?jEEllI. APPBNDAOE OFCRUSTACEAN, AND RAISED DEP()SI IS FI!()A[ DRY VALLEY. Fig. 2. A TAN(4LED MASS OF SPONGE SPICULES FROM RAISEDDEPOSITS FROM HUT POINT, ROSS ISLAND [7^0/ace p. 272 UPTHRUST MARINE MUDS 273 As regards the geological age of the raised marine muds, it may be added thata considerable amount of fragments of algce were distributed throughout the d
. British Antarctic expedition, 1907-9, under the command of Shackleton : reports on the scientific investigations ; geology. 0 I 11 I I I I I 11 I I INCHESOl 234-66789 lO lll ! I I i i i I CENTIMETERS Fig. 1. PECTEX COLBECKI, ^EALS? ?jEEllI. APPBNDAOE OFCRUSTACEAN, AND RAISED DEP()SI IS FI!()A[ DRY VALLEY. Fig. 2. A TAN(4LED MASS OF SPONGE SPICULES FROM RAISEDDEPOSITS FROM HUT POINT, ROSS ISLAND [7^0/ace p. 272 UPTHRUST MARINE MUDS 273 As regards the geological age of the raised marine muds, it may be added thata considerable amount of fragments of algce were distributed throughout the deposit,and these show little signs of decomposition or alteration. Mi-. Hallman commentson the fact that at one point there are remains of a small chitinous avicularium,attached to one of the specimens of Lepralia. The fact, therefore, that theanimal matter has not yet been lost is proof of the comparatively recent age ofthis deposit. These observations clearly point to the elevated muds belonging to very recentgeological time, and if the ice domes in the neighbouring areas are due to settle-ment, consequent on withdrawal of the ocean, the movement is actually still inprogress. On the whole, we strongly favour the view that the marine muds nearBackstairs Passage owe their elevation to upthrust by glacial
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