There is a partially evolved feather on Longisquama. See my web page
http://www.flash.net/~mortongr/longisq.htm
It apparently acted as a glider wing
I have had to change my email address due to some technical problems.
glenn
Foundation, Fall and Flood
Adam, Apes and Anthropology
http://www.flash.net/~mortongr/dmd.htm
Lots of information on creation/evolution