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2 . Definition See Execut ive Commdttee red tuff 3 . Type section a. Location Southeas tern s lope o f Executive Commdttee Range b. Thickness 300 meters c . Lithology Yellow tuff , porous , great amount o f brecciation , laminated and stratified with lapilli assuming a lineat ion , 1-3 em spheroids , h igh moisture content and earthy texture . d . Relation to other units 4. Remarks Overlies Execut ive Commdttee red tuff Overlain by Executive Coaadttee grey tuff Occurs on Mt . S idley Finger MOuntain sandstone 1 . First published us e Hamilton , W . , and P . T . Hayes . Type section o f the Beacon Sandstone of Antarct ica : USGS Prof Paper 456 -A , p . 1 ·18 , 1963 . 2 . Definition "That part of the Beacon above the s andstone of Pyramid Mountain is probably best des ignated as a s ingle unit, which we will call the sands tone of Finger MOuntain after the well-known landmark upon which it is well exposed. ⢠⢠⢠The sandstone of Finger Mountain , which lies conformab ly upon the sandstone of Pyramid MOuntain , cons ists of sandstone , shale , and a i lts tone , weathering to s lopes and ledges . " (Hamilton and Bayes , 11 ) 3 . Type sect ion a . Location West of Beacon Dry Valley , 2 ·1/2 miles south of Pyramid MOuntain , Victoria Land - 31 -
b . Thickness 630 feet in study area , but top absent c . Relat ion to other units Overlies Pyramid Mt . sandstone 4 . Synonyms or closely related names Member B and c of MCKelvey , B. c. and Webb , P . N . , 19 59 , Geological invest igat ion in South Victoria Land , Antarct ica , Pt . 2 , Geology of upper Taylor Glacier region : New Zealand Jour . Geo logy and Geophys ics , v. 2 , p . 718 -728 . 5 . Remarks Member of Beacon Sandstone Fleming granite 1. Firs t published use Knowles , P . H . Geo logy of the Southern Palmer Peninsula : Am. Phil . Soc . Proc . 89 ( 1 ) , p . 139 -140 , 1945 . 2 . Definition "The rock which forms the bold cliffs of Fleming glacier is a medium-grained , buff-colored, graphic hornblende granite . (Knowles , 1945) 3 . Type sect ion a . Locat ion Fleming Glacier b . Lithology ⢠⢠" Graphic hornblende granite ; cons iderable alteration , mafica going to chlorite and feldspars to sericite . c . Relat ion to other units Cut by a roughly parallel set of augite basalt dikes , a few inches to 10 feet in width . - 32 -
Fortress Sequence 1 . Firat published use Mirsky , A. Recons ideration of the "Beacon" as a stratigraphic term in Antarct ica : Polar Record Vol . XI, no. 7 5 , P ⢠767 , 1963 . 2 . Definition "The Fortress Sequence includes all strata between the peneplaned late Precambrian to early Paleozoic basement and the major unconformity representing the Carboniferous . All units in this sequence probably are Devonian . Basal beds represent ing initial depos ition on the basement are included in the Windy Gully Format ion. The overlying Razorback Formation forma the bulk of the Fortress Sequence and is mostly clean quartz -sands tone . " (Mirsky , 767 ) 3 . Type section a. Location Southern Victoria Land b . Lithology Cons ists of 2 formations : 1) the lower , Windy Gully Formation : basal conglomerat ic sands tone . 2 ) the upper , Razorback Formation : clean quartz -sands tone . c . Relat ion to other units Overlain unconformably by Bas t ion Sequence d . Evidence for age ⢠⢠⢠⢠"Upper Devonian fish remains found in a moraine of Mackay Glacier and Middle or Upper Devonian fish remains found in three localities in the upper Skelton Glacier area. " (371 ) . A . Mirsky ; Recons ideration of the "Beacon" as a strat igraphic term in Antarctica ; Antarctic Geology� Proc ⢠. Capetown Sympos ium 1963 , John Wiley and Sons , p . 364-378 , 1964 . 4 . Synonyms or closely related names Beacon Sandstone ( 39 ) H. T . Ferrar ; Report on the field -geology o f the region explored - 33 -
by the ' Dis covery ' Antarct ic Exp.edition , 1901â¢4 ; Nat . Antarct . J!:x.ped. 1901-4 1 Nat . Hist ⢠., 1 ; p . 1 .. 100 , 1907 . Beacon Group ( 279 ) A . D . Allen ; Geologic invest igations in southern Victoria Land , Antarctica. Part 7 . FormatioDS of the Beacon Group in the Victoria Valley region ; N. z . J. Geo l . Geo1)hys . 5 (2) ; P⢠278 -94 , 1962 . Beacon Sediments ( 723 ) Fosdick basalt B .. c. McKelvey , P . N . Webb ;· Geological tuvest igati.ons in south Victoria Land , Antarctica. Part II . Geology of the upper Taylor Glacier region ; N . Z . J. Geol . Geophys . 2 (�· ) , P ⢠718-728 , 1959 . 1 . First published use Warner , Lawrence A. Structure and Petrography of the Southern Edsel Ford Range , Antarctica : Am. Phil . Soc . Proc . 89 , p. 78 -127 , 1945. 2 . Definit ion "All the specimens so far collected from the region are of basalt ic compos it�on. It is doubtful whether other types of lava occur . To judge from the character of the s amples , most of the volcanic material is scoriaceous ash . Some fairly dense specimens , presumably from flows , show olivine-rich segregatioDS , from 1 to 10 em. in diameter enclos ed in a black fine-grained groundmass . " (Warner , p . 112 ) 3 . Type section a. Location Eastward from Mount Marujupu along the axis of the Fosdick Range b . Lithology Basaltic ash , composed of Mg·olivine , Mg-pyroxene , picotite , feldspathoids , bas ic plagioclase , and iron ore . c . Relat ion to other units Cuts and overlies mus covite granite and granodiorite - 34 -
