companion question: Why Perseverance's landing ellipse straddled the cliffs in the river delta; why so ambivalent about the two different geologies?

It may be worth asking this question on the Earth Sciences Stack Exchange, since it's more or less about geology. You might get a faster or better answer there.

@Phiteros Disagree. I've asked how the labeled regions within Jezero crater are designated, where the line between the two regions falls, and on which side of that line has Perseverance landed. A reading of my question will show that, at which time it should be clear that Earth Science SE people may not have as ready access to that information about these aspects than folks here will.

I did read your whole question. But what you're asking about is if there is a hard boundary between two geologic features. Someone more proficient in geology might be able to help you out more/faster, and you'll probably find more of those people on Earth Sciences.

Disagree again! I've asked precisely this: "Is there a borderline?" I didn't ask about a "hard boundary". These are very different concepts; anybody can draw a borderline, and Perseverance mission scientists will have drawn this one. Why change my wording?

I was just offering a suggestion and you don't need to accuse me of not reading the question. The reason I pointed out the title of your other question was because it was worded very poorly.

@Phiteros you've suggested twice now that I've posted this question in the wrong site. I post questions in several sites; 158 questions in Earth Science (16 of them about Mars!) and a few thousand here. I already have a good idea how well different kinds of question gets answered in each site, and questions about details of specific regions in Jezero Crater are better asked here

I didn't suggest that you posted it in the wrong site. I just said that you might get a faster or better answer elsewhere.

You don't need to attack me. You could've just said "Thanks, but I think it fits better here; I've asked other questions in Earth Sciences, and I think this will do better on Space Exploration."

I'm not saying that you're wrong for posting it here or anything. I'm just trying to help you get an answer.

You don't need to defend yourself to me. I was just offering a suggestion in good faith.

So I'm sorry if it seemed like I was telling you it shouldn't be here. That's not what I was thinking.

I replied there, but here's some closing thoughts on my part, and I didn't know you wrote anything here because I didn't receive any more notifications. I realize now that I wouldn't have until I join the room at least once.

Comments are visible to everyone, so my responses to comments will always be directed at their readers, which is everyone; the user I'm replying to being just one of that group. After having many questions closed for "better asked on" my primary concern is to respond by explaining decisively why I feel the advice is incorrect in order to end the "better asked on" discussion.

Once a question has been around a few days and had some traction, it's much less necessary to worry about this problem, but for the first day or so, or until some answers have been posted, I have found this kind question stewardship necessary.