Our tests of geologic time are denudation and deposition.

We are told "the present rate of denudation of a continent is known with considerable accuracy from careful measurements of the quantity of solid matter carried down by rivers."

Now it is a considerable tax on our faith in science to believe that the débris of the Mississippi can be so accurately gauged as to give anything like approximate value to the result of one foot of continental denudation in 6,000 years.

Assuming this rate of denudation as certain, and also the estimate of the known sedimentary strata as 177,000 feet in depth, we are to conclude that the formation took 56,000,000 years.

A mountain mass which ought to answer to certain fault 15,000 high, and therefore is presumed to have vanished by denudation, points to a term of 90,000,000 years as required for the process.

"We have to fall back, therefore, on the geological evidence of deposition and denudation ... in any attempt to decide between the 200,000 years of Lyell and the 20,000 years of Prestwich."

He has, at first sight, a very simple measurethat of denudation.

A number of observations as to the present rate of denudation, and a sum which any railroad contractor can do in his head, to determine the solid contents of the valley, are all that are needed.

Commencing from the coast, the first 100 miles is almost exclusively of tertiary sandstone formation, which the process of denudation has, in many instances, converted into either stony or sandy tracts, rarely fertile, except when subject to the influence of frequent inundation.

The mountain has hurled these out; and everywhere, as a glance of the eye shows, the tropic rains are carrying them yearly down to the lowland, exposing fresh surfaces to the action of the air, and, by continual denudation and degradation, remanuring the soil.

If, as cannot be doubted, denudation by rain has gone on here, for thousands of years, at the same pace at which it goes on now, the amount of soil removed must be very great; so great, that the Naparimas may have been, when they were first uplifted out of the Gulf, hundreds of feet higher than they are now.

Divestment N. divestment; taking off &c v.. nudity; bareness &c adj.; undress; dishabille &c 225; the altogether; nudation^, denudation; decortication, depilation, excoriation, desquamation; molting; exfoliation; trichosis [Med.].

The Upper Rhine flows in one of these great valleys of subsidence for about 180 miles, from Mulhausen to Frankfort, in a generally straight line, though modified by denudation.

Owing to the absence of rain and rivers, denudation such as we experience would be unknown, though the superficial scoriaceous crust might be partially broken up by expansion and contraction, and suffer a certain amount of atmospheric erosion.

But as the production of the fissures might have occupied perhaps millions of years, a considerable amount of atmospheric denudation would result, however slowly it acted.

They were mostly about 13 miles high, indicating considerable aerial disturbance on the planet, and therefore capable of producing proportional surface denudation.]

In 1896, Professor Shaler, than whom no one has spoken with greater authority on this subject, estimated that in the upland regions of the states south of Pennsylvania three thousand square miles of soil had been destroyed as the result of forest denudation, and that destruction was then proceeding at the rate of one hundred square miles of fertile soil per year.

We also see the rising of mighty temples and monumental buildings, but this again only contributed to the denudation of the country.

The stone is an effect of denudation and is similar to other isolated sandstone rocks scattered about the south of England, e.g., the "Toad" Rock at Tunbridge Wells and "Great upon Little" near West Heathly in Sussex.

At one time supposed to have been brought to their present position by glacial action, they are now said to be, and undoubtedly are, the result of denudation.

In the state of uncertainty, embarrassment, and denudation in which you have placed yourselves, you have no strength, I can feel, I can see.

And when we examine the escarpments, hills, buttes, and other monumental masses of the plateau on either side of the cañon, we discover that an amount of material has been carried off in the general denudation of the region compared with which even that carried away in the making of the Grand Cañon is as nothing.

Cebu it has been removed by denudation, with the exception of a few pillar-like blocks which remain, and which are conspicuous from the anchorage.

The surface is scooped out into irregular basins and sharp projecting pinnacles and covered in all directions with mud, resulting from the denudation.

And a hand pointed to the uncovered bed, and to the empty table and empty clothes-racksthe careful denudation of unoccupied rooms.