The Late Jurassic <answer>Archaeopteryx</answer> is well known as one of the first transitional fossils to be found, and it provided support for the theory of evolution in the late 19th century. <answer>Archaeopteryx</answer> was the first fossil to display both clearly traditional reptilian characteristics: teeth, clawed fingers, and a long, lizard-like tail, as well as wings with flight feathers similar to those of modern birds. It is not considered a direct ancestor of birds, though it is possibly closely related to the true ancestor.
What was the first fossil to display both clearly traditional reptilian characteristics?
Archaeopteryx