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    Foraminifera from the Deep Lake Terraces, Vestfold Hills, Antarctica

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    J_Foramin_Res_10_303.pdf (978.4Kb)
    Date
    1980
    Author
    Setty, M.G.A.P.
    Williams, R.
    Kerry, K.R.
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    Abstract
    Fourteen species of planktonic and forty-two species of benthonic foraminifera are identified from two transects of terraces near Deep Lake in the Vestfold Hills, Antarctica. All the planktonic and a few of the benthonic species occur on the western shore of the lake in well preserved condition, some of the forms are very small and rare. @iCassidulina@@ and @iTrochammina@@ are dominant while @iCibicides@@ and @iGlobigerina@@ are common constituents of the foraminiferal faunas. @iNeogloboquadrina pachyderma@@ is significantly absent from all samples. Several of the species in the Deep Lake terraces were previously reported from the Ross Sea, McMurdo Sound, South Georgia, and the Falkland Islands sectors of Antarctica. Three possible explanations regarding disparity in abundance (paucity or even absence) of foraminifera in samples from identical elevations in the two transects are proposed: differential wind erosion occurred and foraminifera were deposited elsewhere; the faunas are remnants of debris bands from a former ice sheet and were deposited differentially when the ice ablated; variations in physiography and wind erosion, coupled with differing amounts of glacial debris deposited in the terraces, caused the observed distribution pattern. @iGlobocassidulina biora@@ and @iCassidulina subglossa@@ are present in the Deep Lake terraces and have living representatives in nearby areas. Dissolution effects, notably chalky appearance, loss of ornamentation, and thinning and fragmentation of tests were observed and were especially obvious in the @iCassidulina, Cibicides, Nonionella, Hyalinea@@, and @iTruncatulina@@. Causative factors for this dissolution include the very high salinity, very low temperature, and high dissolved carbon dioxide contents of the waters of Deep Lake. Terrace samples containing chiefly agglutinated species further suggest dissolution and elimination of calcareous specimens
    URI
    http://drs.nio.org/drs/handle/2264/6828
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