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SUMMARY
On the Geology of
Hestgerðismúli
by
Jón Jónsson
National Energy Authority,
Grensásvegur 9,
108 Reykjavík, Iceland
The paper briefly describes a volcanic
breccia, earlier mentioned by G.P.L.
Walker & D.H. Blake (1966), who con-
sidered it as valley filling, superimposed
on the Tertiary flood basalt formation at
Hestgerðismúli in S.E. Iceland.
For the formation the author provision-
ally uses the name Múli Formation. It
consists of volcanic breccia with a great
deal of columnar jointed basalt, pillow la-
va, palagonite tuff and breccia, partly su-
perimposed on tillite and varved fine-
grained sediment, partly intercalated in
the rock. The formation, which might be
of early Pleistocene age, has a thickness
of approximately 100 m and is thought to
have been formed subglacially. The ques-
tion as to whether this formation was
formed on the spot or as a lava flow from
an unknown volcano is as yet unresolved.
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