Hi willywagtail!
Seems I must be the one sleepwalking.
I guess I assumed it was the Colossus 106 Baffler, which I have posted off and did not keep a copy.
Somewhere, very recently, there has been a clue on American desert formation and the answer was BUTTE (and it would have been a Lovatts).
(which is why I wrote "from memory")
Have I led tuesday astray?
I hope not.
If so, my sincere apologies!