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I think they are just a splash of secondaries rather than a chain. We've come to realise that chains are unlikely to show up on the scale of images Moon Zoo uses and are best seen in wide-field. Having said that we have come across the unexpected already!
I do not know if I put on the forum each found object?and only the most interesting (subjective)?Here we have a crater chain (red circle).-inconspicuous I'm not sure that there is no continuation? (yellow line)