New PDF release: Concerning the Division of the Plane by Continua

By Kline J. R.

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Additional resources for Concerning the Division of the Plane by Continua

Sample text

I look in wonder at the stratum on which I sit. I have c o m e from a land where even the young Ice Age deposits are tilted, where the ages of the rocks can be counted in only thousands of years, and now I sit on a stratum that is still nearly as horizontal as it was when it was deposited as sediment on a seabed more than 4 0 0 million years ago. The Midwest has clearly escaped the fury of mountain building and the collision of exotic terrains; during its geological history the land has been, at most, gently warped.

When these glaciers finally receded, the sea level rose again, and the temperatures of both air and seawater rose as well. Like an increase in the oxygen level, a rise in the temperature of the sea greatly increased the ability of animals to form skeletons. The latest part of the Precambrian Era was a time of increased biotic diversity as new species were formed. But it may not have been only species that proliferated; the fossil record of this time suggests that the number of animal and plant individuals increased greatly as well.

Because extinction is inevitable, in any given time frame some species are going extinct. The extinction of any given species always has a cause, loss of habitat, loss of food source, the introduction of a new p r e d a t o r — b u t since such conditions can always be found somewhere, the particular extinction can be treated as a random phenomenon. This ongoing background extinction, as it is called — that is, the number of species dying out over a given interval of time — appears to have occurred at a relatively constant and sustained rate throughout all of the hundreds of millions of years since life began.

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Concerning the Division of the Plane by Continua by Kline J. R.


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