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Hi Trav,
It was almost certainly Rupes Recta in Mare Nubium as Denis has noted. It is otherwise known as the "straight wall" -- a very distinctive feature at 7-8 days into the lunation it was very distinct last night night.
It is a fault-line -- real length is a bit over 100km. In a couple of days time the shadow it casts will disappear as the Sun climbs higher and it will become much, much more difficult to see.
Good catch.
Doh!! I think I just made an admission that I look at the Moon -- that could potentially have me kicked out of the deep-sky observers guild whose members must swear a blood-curdling oath never to look at it.
Best,
Les D
Contributing Editor
AS&T
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