Lexicon of Antarctic Stratigraphic Names Introduced by Members of United States Expeditions (1972) / Chapter Skim
Currently Skimming:
Pages 20-30
The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.
From page 20... ...
b . Thickness At leas t 6600 feet .
|
From page 21... ...
2 . Definit ion "The igneous rocks lie for the most part to the eas t of East Base and are compos ed of hornblende granite wh ich is somewhat variable in texture ; the mineral c�a ition , however , is uniform." (Knowles , 1945)
|
From page 22... ...
3 . Type sect ion a.
|
From page 23... ...
b. Thickness 15 , 000 feet estimated; 4600 feet minimam �ade, F
|
From page 24... ...
c . Evidence for age E lbow Formation A spec imen from Peeler ' s Pinnacle on the E ights Coast yielded lead-alpha age from z ircon of 150 ± 20 m.
|
From page 25... ...
d . Relation to other units Conformably overlies E lliott Sandstone .
|
From page 26... ...
c . Lithology Pink to buff cross -bedded , coarse-grained sands tone , with thick and thin interbedded conglomerate beds and minor thin red shaly beds in lower half.
|
From page 27... ...
c . Lithology Quartz ite and marble (brecciated locally)
|
From page 28... ...
2 . Definit ion See Execut ive Committee red tuff " cross -bedding , intercalat ion of strata , and part ial raunding of volcanic fragments characterizes the grey tuff , which thus resembles a river depos it .
|
From page 29... ...
grooves , 10-15 cent imeters in depth , apparently the result of abras ion by rock fragments imbedded in s lowly flowing glacier ice ." (Doumani , 707 )
|
From page 30... ...
2 . Definit ion "Overlying the basalt are three dis t inct rock units cons is ting of compacted , fine-grained volcanic fragments , or tuff .
|
Key Terms
This material may be derived from roughly machine-read images, and so is provided only to facilitate research.
More
information on Chapter Skim is available.