Náttúrufræðingurinn - 2004, Blaðsíða 36

Náttúrufræðingurinn
gether as one species in most papers. H.
rugosa is a larger form than H. arctica, but
they both seem to bore into the bottom if
the substrate is suitable. H. rugosa appar-
ently originated in the Atlantic, whereas
H. arctica probably originated in the
Pacific and migrated to the North Atlantic
via the Bering Strait while the Serripes
Zone on Tjömes, north Iceland, was
deposited 3.6 Ma ago.
According to Strauch28 Hiatella arctica
is the only Hiatella spedes in the North
Atlantic and Parific and it can be used to
estimate palaeotemperatures. He corre-
lated shell length and winter minimum
water temperatures for modem H. arctica
in the North Atlantic as well as the Parific.
With this relationship he was able to infer
Cainozoic palaeotemperatures. This
method has been discussed and it has
been stressed that in the Pacific the length
is govemed by mode of life of each popu-
lation and not only the temperature.30
Therefore, this method should be used
with care as an exact palaeothermometer,
although it is often a good indicator.
Þakkir
Ég stend í mikilli þakkarskuld við Guðrúnu Þórarinsdóttur sem hefur lesið
yfir handritið og látið mér í té mjög mikilvægar upplýsingar um rataskel-
jalirfur við ísland. Þá vil ég þakka Oddi Sigurðssyni sem myndaði allar
skeljarnar á 1. mynd. Ennfremur vil ég þakka Rannsóknasjóði Háskóla
íslands fyrir að styrkja þessa rannsókn.
Heimildir
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PÓSTFANG HÖFUNDAR/AUTHOR’S ADDRESS
Leifur A. Símonarson
leifuras@raunvis.hi.is
Raunvísindstofnun Háskólans/Science Institute
Öskju, Sturlugötu 7
IS-101 Reykjavík
Um höfundinn
Leifur A. Símonarson (f. 1941) lauk magistersprófi í
jarðfræði frá Kaupmannahafnarháskóla 1971 og licenti-
at-prófi frá sama skóla 1978. Hann er prófessor í
steingervingafræði við Háskóla íslands og hefur
einkum fengist við rannsóknir á tertíerflóru íslands og
sælindýrafánum frá síðari hluta tertíers, ísöld og nútíma
á íslandi og Grænlandi.
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