The cause of the so-called Glacial Epoch in the earth’s history has been much discussed.

This occurrence of loess is the more noteworthy, since loess is rarely found in association with drift of the last glacial epoch.

This is believed to be connected with the glacial epoch and the augmentation of the streams during those periods when the ice was melting away.

I thought myself therefore justified in considering this as a case of varieties which have come into existence subsequently to the Glacial epoch.

Several of these large animals survived the vicissitudes of climate characteristic of the Glacial epoch, but have since become extinct.

Yet it is found that since a period prior to the great Ice Age, or Glacial epoch, it has remained absolutely unchanged.