ring-plain

As we gazed upon it I explained that the formation, which is known as "Wargentin," would probably in the usual course of events have been a ring-plain about fifty-four miles in diameter, but it really is a high plateau of that size, with very low ramparts.

To Mars via The Moon An Astronomical Story Mark Wicks

It is evidently a ring-plain which became filled to the brim with lava, or mud, that welled up from the interior of the moon; and the mountain walls, being exceptionally strong and without any breaks or gaps, withstood the enormous pressure of the lava, which therefore solidified and formed the great plateau as we now see it.

To Mars via The Moon An Astronomical Story Mark Wicks

It is a ring-plain nearly fifty-six miles in diameter, the mountain walls having some peaks over 17,000 feet in height.

To Mars via The Moon An Astronomical Story Mark Wicks

This is an enormous ring-plain, being over 142 miles in diameter, and encloses an area of 16,000 square miles, thus being half the area of Scotland.

To Mars via The Moon An Astronomical Story Mark Wicks

"This range curves round towards the east, and finishes with a fine ring-plain called Eratosthenes -- some thirty-seven miles in diameter, with a floor depressed 8000 feet below the lunar surface.

To Mars via The Moon An Astronomical Story Mark Wicks

"Close to Aristarchus you will notice another ring-plain, which is called Herodotus, about twenty-three miles in diameter, with a floor

To Mars via The Moon An Astronomical Story Mark Wicks

"Almost due east of Copernicus is another bright and isolated ring-plain named Kepler, after the celebrated astronomer.

To Mars via The Moon An Astronomical Story Mark Wicks

"Farther eastward, and lower down on the Ocean of Storms, you will observe what is admitted by all to be the very brightest large formation upon the moon, viz. Aristarchus -- a ring-plain nearly thirty miles in diameter, the floor of which is 5000 feet below the surface level.

To Mars via The Moon An Astronomical Story Mark Wicks

"Turning from this towards the south-west you will see the most majestic formation to be found upon the moon -- the great ring-plain called

To Mars via The Moon An Astronomical Story Mark Wicks

Mr. Elger then proceeds to describe his discovery in 1883, in the ring-plain Mersenius, of a cleft never noticed before, and which seems to have been of recent formation. [

Other Worlds Their Nature, Possibilities and Habitability in the Light of the Latest Discoveries 1890