Some Engineering Problems Of The Panama Canal In Their Relation To Geology And Topography
Forfatter: Donald F. MacDonald
År: 1915
Forlag: Washington Government printing Office
Sted: Washington
Sider: 88
UDK: 626.1
Published With The Approval Of The Govenor Of The Panama Canal
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BUREAU OF MINES
BULLETIN 86 PLATE 11
HILL TYPE OF TOPOGRAPHY, LOOKING NORTHWARD AND NORTHEASTWARD FROM ZION HILL, CULEBRA.
a, Head offices, Culebra, b, Empire, c, Culebra basin—it extends to the right across the canal, d, Culebra Cut. e, Even crests of the ridges
where there are no (or only a few small) intrusions of volcanic rocks, f, Wave-like unevenness of surface, due to intrusions of hard lava,
mostly basalt plugs, etc.