Hi have just acquired a 94 Muirwoods frame in blue in NZ.
I have posted the pics on flickr under those search terms.I think I am marin_muirwoods94 ( :
'marin' 'muirwoods' '1994'
There should be some crossover with the Bear Valley model if you can recall what they looked like? The vertical font 'marin on each fork blade for example? As per bensherman's above. It is that type of frame and h/bar,stem layout.
The muirwoods decal for eg is about 16" long on the top tube and not tiny like the pine mountain. Also a USA flag near the seat post on RHS top tube. 'Marin County race proven' circular decal on seat post and 'afterburners' on rear forks. Marin lite for stem and bars.
I have the frame number too in the flickr set. so would be interesting to compare frame numbers and graphics.
I cannot attach a pic here but may do later.