| 1944 W. Ley in Astounding Sci. Fiction Dec. 121/2
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But then the younger crater should be considerably higher than the old eroded ringwall and the floor, again, should be considerably above mean Moon level. And that a secondary crater should break through the old ringwall, just at the spot where a lot of additional weight is piled on, is a harder strain on the imagination that one could reasonably be expected to stand.
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| 1993 P. Anderson Harvest of Stars (1994) 139
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The train climbed Tycho's ringwall, swooped down again, whizzed across the crater floor, and plunged underground near Skyview Tower.
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| 1994 B. Bova Craft of Writing Sci. Fict. that Sells iv. 22
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He stepped down from the jumper‥and planted his boots on the solid rock of the ringwall's crest.
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| 1994 B. Bova Craft of Writing Sci. Fict. that Sells xiv. 142,
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I was somewhat surprised to see the barriers rising like concentric ringwalls, each of them centered on the golden glowing ship and the aliens within it.
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