Full record for ringwall n.
||a roughly circular ring of cliffs/mountains surrounding an impact crater
||C. Bonestell & W. Ley in Astounding Sci. Fiction
||Fred Galvin submitted a 1949 cite from "The Conquest of Space"; Mike Christie checked the 1944 first magazine appearance and discovered that the term was used in that version too.
Earliest cite in the OED: 1950.
||6 July, 2008
Citations for ringwall n.
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| 1944 W. Ley in Astounding Sci. Fiction Dec. 115/2
||The second and in certain respects most puzzling type are the numerous ringwalls or craters which range all the way from gigantic ‘walled plains’—of which Clavius is a fine example—to ‘normal’ Moon craters like Copernicus, and small ‘craterlets’ to tiny ‘beads’.
| 1944 W. Ley in Astounding Sci. Fiction Dec. 121/2
||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.
| 1993 P. Anderson Harvest of Stars (1994) 139
||The train climbed Tycho's ringwall, swooped down again, whizzed across the crater floor, and plunged underground near Skyview Tower.
| 1994 B. Bova Craft of Writing Sci. Fict. that Sells iv. 22
||He stepped down from the jumper‥and planted his boots on the solid rock of the ringwall's crest.
| 1994 B. Bova Craft of Writing Sci. Fict. that Sells xiv. 142,
||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.