Acta naturalia Islandica - 01.07.1964, Page 32

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SIGURDUR STEINTHÓRSSON
Members 2 to 4 are, most likely, closely related in time. The other two
may or may not be contemporaneous, but the uniform composition of the rocks
seems to indicate rather that the various intrusions Were not far removed
from each other in time.
It appears that the whole group has been tilted towards the SW as
evidenced by the dip of the inelusions. A certain amount of faulting has taken
place as well. Probable faults are drawn on the map in Fig. 2.
EPILOGUE AND ACKNOWLEDGEMENTS
The Hvammsmúli ankaramites are by no means the only rocks of this type
in the Eyjaf jöll area. The writer has found boulders of apparently similar rock
in Thórsmörk north of Eyjafjöll, and Dr. T. Tryggvason, geologist in Iceland,
presented him with a boulder from the river Jökulsá, south of Eyjafjöll. It is
therefore evident that the rocks are widespread here. They add a new para-
graph to the splendid textbook of igneous geology which the Eyjafjöll area un-
doubtedly is.
The field work for this thesis was carried out during the summer of
1963. The laboratory work was started in the University Research Institute,
Reykjavik, where the Writer worked during the summer, and carried to its
conclusion in St. Andrews.
The writer is greatly indebted to Dr. G. E. Sigvaldason, geochemist in
Reykjavik, and to Mr. R. Johnston, St. Andrews, for their invaluable help and
guidance, and their stimulating interest taken in the work in the form of
criticism, constructive and otherwise. Thanks are also due to Mr. Johnston
for the photomicrographs, and to Dr. Sigvaldason for the X-ray analyses.
The writer also wishes to record his thanks to the following: •— Dr. Drever,
for ready help, comments and suggestions as to literature, Mr. Methven, techni-
cian in St. Andrews, and Mr. G. Egilsson, liomo universalis in the University
Research Institute, Reykjavik, for the preparation of the thin sections, Mr. O.
Bjarnason, director of the University Research Institute, for granting the
writer the liberty to work on the thesis in the Institute; professor Davidson,
for financial support from departmental funds; Mrs. Galloway, departmental
secretary, for the typing of the manuscript; Mr. Mackie, for the preparation
of the photographs; Dr. S. Thorarinsson, Reykjavik, for advice concerning
tephrochronology; Dr. MacGregor, for discussion about the artistic aspect of
the maps and diagrams; Dr. T. Tryggvason, Reykjavik, for a specimen;