Revived by the uplift, the streams of the area trenched it as deeply as its elevation permitted, and reaching grade, opened up wide valleys and new peneplains in the softer rocks.
Where peneplains have been uplifted to great height and have since been well dissected, and where they have been upfolded and broken and uptilted, their recognition becomes more difficult.
We have positive evidence that more or less well-developed peneplains of considerable extent existed in various parts of the earth at various times during the many millions of years of known earth history.
Geologically recently upraised, fairly well developed peneplains are southern New England and the great region of eastern Canada.
The two ancient peneplains referred to above, the histories of which are recorded in the topography, have received definite names in order that they may be readily designated.
Profile showing relation of ancientpeneplains in the Appalachians 81 18.
Geologists call it a peneplain, which means nearly-a-plain; it is from fragmentary remains of peneplains that they trace ranges long ages washed away.
The Appalachian Mountain uplift, which, roughly speaking, embraces all the ranges constituting the eastern rib of the continent, may be considered to include also the very ancient peneplains of New England.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "peneplains" in a variety of sentences. We hope that you will now be able to make sentences using this word.
