No sh*t, Sherlock

"No sh*t, Sherlock" - who coined that?
Five years ago I am pretty sure I had never heard it; now I sometimes find myself saying it, and I have no idea where or when I first encountered it.

I recall an American friend (from Queens, New York) using it in the early 1970s.

1970s, originally U.S., ext. of "No, ****!" (late 19c). Sherlock is a pun on Holmes!, which itself puns on "homes"; plus ironic use of the fictional detective SHERLOCK Holmes. From Cassell's Dictionary of Slang by Jonathon Green (Wellington House, London, 1998). Page 847. I'm not sure what all that means -- the homes part.