Náttúrufræðingurinn - 1988, Blaðsíða 42

HEIMILDIR
Helgi Pjeturss 1910. ísland - Handbuch
der regionalen Geologie, Band 4, 1. 1-
22. Heidelberg.
Helgi Torfason 1979. Investigations into
the structure of South-Eastern Iceland.
Óprentuð Ph. D. ritg. University of
Liverpool. Englandi. 587 bls.
Helgi Torfason 1985. Jarðfræðikort af ís-
landi, blað 9, Suðausturland
(1:250.000). Náttúrufrœðistofnun ís-
lands og Landmœlingar íslands,
Reykjavík.
Jón Jónsson 1954. Outline of the geology
of Hornafjörður region. The Hoffells-
sandur, I. Geografiska Annaler 36.
146-161.
Jón Jónsson 1955. Tillite in the basalt
formation of East-Iceland. The Hof-
fellssandur, II. Geografiska Annaler.
37. 170-175.
Jón Jónson 1979. Jökulbergslagið í Græna-
felli. Týli 9. 15-16.
Robert, E. 1840. Mineralogie et geologie,
lre. partie, Voyage en Islande et au
Groenlande. Arthus Bertrand, Paris.
468 bls.
Walker, G.P.L. & D.H. Blake 1966. The
formation of a palagonite breccia mass
beneath a valley glacier in Iceland. Qu-
art. Journ. Geol. Soc. London 122.
45-61.
Þorvaldur Thoroddsen 1914. Ferð um
Austur-Skaftfellssýslu og Múlasýslur
1894. í Ferðabók III. Hið íslenska
frœðafélag, Kaupmannahöfn. 360 bls.
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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