People,
I was looking through the telescope last night and passed over the crater Alphonsus. It was too bright already to get a good look, but I saw something that caught my eye.
It is a crater with a smooth floor in the middle of a mountainous area. And I don't mean mountain ranges with valleys in the middle; but rather pure rigged mountainous relief. I looked at the Rukl Lunar Atlas, and it describes the crater without using the word crater; it just says "ringed mountain". That struck me, too, because there is no such thing a a circular mountain chain.
Anyway, today I looked at the Lunar Atlas again, but this time I looked a the second editiion because I have one that I take to the field, so to speak, which is all beaten up´; and another one that I keep on the bookshelf which is still like new.
Anyway, they changed the description and call it a "complex crater" now. It is niether one!
I studied some images from Google, and the image on my Crater origins page, and it is a very strange crater. The inner wall looks kind of straight-lined along at least two sides, but definitely circular up top, along the northern wall. But it is circular enough, I think, to correspond to Cater's theoiry of crater formation, which can only explain a roundish crater, and better yet, one with a mountain knob in the middle.
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But I still have some doubts about Cater's theory because the inner walls of Alphonsus, at least, have a sheer drop. In other images besides the one on the page above show the straight-up-and-down face of the inner walls, at least along certain segments.
Maybe it has been formed by chisling it out in in a circular way, starting in the middle, going down deep and then scraping the crater floor. Maybe those craters with those terraced, inner walls and the result of strip mining.
Dean
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