geotherms

As already shown [1], a rise of temperature due to this source of several hundred degrees might be added to such temperatures as would arise from the mere blanketing of the Earth, and the consequent upward movement of the geotherms.

The Birth-Time of the World and Other Scientific Essays John Joly 1895

In other words the geotherms rise into the sinking sediments, always, however, preserving their former average distance from the surface.

The Birth-Time of the World and Other Scientific Essays John Joly 1895

Thus the geotherms must move upwards, and the viscous conditions extend from below; continually diminishing the downward range of the translatory movements progressing in the higher parts.

The Birth-Time of the World and Other Scientific Essays John Joly 1895

In the upper sketch we suppose the lateral compression much developed and the upward movement of the geotherms in progress.

The Birth-Time of the World and Other Scientific Essays John Joly 1895

The time for such events appears to us immense, for millions of years are required for the sediments to grow in thickness, and the geotherms to move upwards; but vast as it is, it is but a moment in the life of the parent radioactive substances, whose atoms, hardly diminished in numbers, pursue their changes while the mountains come and go, and the

The Birth-Time of the World and Other Scientific Essays John Joly 1895

For there has been no absolute rise of the geotherms, the thermal conductivities of both classes of materials differing but little.

The Birth-Time of the World and Other Scientific Essays John Joly 1895

_shifting_ of the temperature levels (or geotherms) into the deposited materials.

The Birth-Time of the World and Other Scientific Essays John Joly 1895