The Journal of Geology, January-February 1893: A Semi-Quarterly Magazine of Geology and Related SciencesVarious
Science
The Journal of Geology, January-February 1893: A Semi-Quarterly Magazine of Geology and Related Sciences
Various
Geology -- Periodicals
_Temperature of the Sea._--The temperature of the English Channel was
similar to that where the isotherm of 32° F. is now situated. The
winter temperature can scarcely have been 20° colder than at present.
The Mediterranean was perhaps 5° colder than now.
_Temperature of the Land (air)._--It does not appear that the climate
of the lowlands of southern Europe can have been 20° lower than the
present mean; 10° or perhaps less appear to have been the refrigeration
in the Mediterranean region. The temperature at the southern margin of
the ice-sheet was about 20° colder than at present. The temperature
increased rapidly towards the south. Recent observations seem to show
that throughout central Europe there was a period of _dry_ cold,
causing the country to resemble the arid regions of central Asia.
J. A. B.
* * * * *
_On the Glacial Period and the Earth-Movement Hypothesis._ By
=James Geikie=, Edinburgh, Scotland. (Read before the Victoria
Institute, London).
Geologists generally admit that there have been at least two glacial
epochs, separated by one well-marked interglacial period. The closing
stage of the Pleistocene period was one of cold conditions in
northwestern Europe, accompanied by land depressions. After this came a
genial climate with a union of the British islands among themselves and
also with the continent. This was followed by a cold, humid condition.
Upham maintains that the whole of North America north of the Gulf of
Mexico stood at least three thousand feet higher at the beginning of
the glacial epoch than at present. Fiords were formed before glacial
times and so can not be cited as evidence of high land during the
glacial period. An elevation of land in the northern part of North
America and Europe could not produce glaciation in their southern
parts. The deflection of the Gulf Stream by the sinking of the Panama,
Professor Geikie argues, could not produce the conditions which
prevailed during the glacial epoch. The Earth-Movement hypothesis, he
believes, accounts neither for the widespread phenomena of the ice-age,
nor for the remarkable interglacial climates. Some maintain that the
warm interglacial period was produced by the rise of the Panama land,
the sinking of the lands to the north, and the turning of the Gulf
Stream from the Pacific into the Atlantic. Why then, asks Professor
Geikie, do we not have such a climate now?
J. A. B.
=_Acknowledgments._=
The following papers have been donated to the library of the Geological
Department of the University of Chicago, mainly by their authors:
=Abbe, Cleveland.=
--On the Production of Rain. 8 pp. 1892.
=Ami, Henry M.=, M.A., F.G.S.
--On Canadian Extinct Vertebrates. 4 pp.--Ottawa Naturalist.
Public-domain text, read in full here on John Shaqi.
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