[BR-Crater] Circle assumption

[Scot Wilcoxon]

I realized there's an assumption underlying seeing circles in scenery:

*Multiple arcs which form a circle are unlikely to happen randomly, so 
it is likely that a single event formed any discovered circle.
*

When we see a circle we are likely to think the entire circle was 
probably created due to something which makes circles.  We should 
examine the reasons for various arcs and not assume the circle was 
created due to a single reason.

Ian has found pieces of evidence which point toward the existence of an 
impact event in the area.  Are there clues in the various arcs which can 
reveal why each arc is visible?  Are we seeing crater-edge fractures, 
changes in impact alterations, surface extensions of deep impact-caused 
faults, mineral fertilization of plants along an old crater rim?
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