Nesbitt Memorial Library Journal, Volume 10, Number 2, July, 2000 Page: 86
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Nesbitt Memorial Library Journal
ern and Western hemispheres remain a mystery. Paleontologists consider that this demise
resulted from such environmental factors as changes in climate patterns, changes in food
supply (especially for herbivores), and hunting pressure wrought by prehistoric people.
As the Pleistocene progressed, the intervals when milder climates prevailed
between advances of the several continental glaciers became, through time, progressively
shorter. It is by no means clear that the world has experienced the last of these devastating
ice ages. Perhaps our planet is merely going through another interglacial period, perhaps a
shorter one than the one preceding, the Wisconsin ice sheet. Perhaps in the dim, distant
future, global climatic conditions might be suitable for another continental glacial invasion.
Some forecasters suggest that temperature reductions might not be required for the return
of such frigid conditions. Rather, only a greater amount of annual precipitation in arctic areas
might suffice to allow ice to again accumulate in the form of massive land glaciers and creep
southward. Happily, there seems to be no indication at present that such an accumulation of
snow and ice is occurring.
Were another Ice Age to occur, an associated megafauna as diverse as the last
one might not emerge from it, because so many forms became extinct toward the end of and
since the last one. There is a definite paucity of large creatures in the northern and western
hemispheres from which a variety of species and subspecies similar to that of today might
evolve. Today the white-tailed deer and the now locally-extirpated mountain lion, black bear,
and bison are the only surviving Ice Age "megafauna" in the Colorado County area. One
must visit Sub-Sahara Africa to view an array of animal life resembling our long-extinct Ice
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Nesbitt Memorial Library. Nesbitt Memorial Library Journal, Volume 10, Number 2, July, 2000, periodical, July 2000; Columbus, Texas. (texashistory.unt.edu/ark:/67531/metapth151409/m1/22/?q=nesbitt%20memorial%20library%20journal: accessed June 24, 2017), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; crediting Nesbitt Memorial Library.