Lexicon of Antarctic Stratigraphic Names Introduced by Members of United States Expeditions (1972) / Chapter Skim
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Pages 54-58
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From page 54... ...
Johnson Nunatak sands tone 1 . l�irs t published use Laudon , T .
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From page 55... ...
b . Lithology In granite : holocrystalline aphanitea , intergranular texture euhedral to subhedral plagioclase as calcic as An7o , probable pigeonite , interst it ial magnetite , quartz , K-spar, chlorite , and calcite .
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b . Re lation to other units Overlies Jones MOuntains granite Intruded by Jones MOuntains fels ite and Jones Mountains basalt Overlain unconformably by Jones MOuntains olivine basalt c .
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d . Evidence for age K-Ar age determination of late Me sozoic for the fe l s ite .
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From page 58... ...
"A K-Ar age of 199 + 6 m.
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