everything mark said... and
Nobody knows what Archaeopteryx is. It could represent an entire variation of a kind that became extinct in the Flood, and our friend A could simply be the only discovered preserved fossil from the clan. There is no need whatever to assume descent. Design covers it all just fine. Whatever it is it was designed to be.
why is it that yecs keep insisting that things went extinct in the flood. and you professing that a whole KIND went extinct in the flood is even worse. at worst, noah was supposed to have taken two to five to seven of every KIND of animal. thus, no single KIND would have conceivably gone extinct in the flood. your own arguments have defeated you.
and that's assuming that KIND means CLASSIFICATION (biologists read: family) and not specific species and thus two to five or seven of EVERY SINGLE ANIMAL IN EXISTANCE being on the ark.