Was Archaeopteryx a flyer or glider?

Archaeopteryx lithographica is the most primitive bird known. 


Archaeopteryx means "Ancient Wing".

There are still debates whether Archaeopteryx is a glider or capable of powered flight.


As in the wings of modern birds, the flight feathers of Archaeopteryx were somewhat asymmetrical and the tail feathers were rather broad. 


This implies that the wings and tail were used for lift generation. 


However, it is unclear whether Archaeopteryx was simply a glider or capable of flapping flight. 


The lack of a bony breastbone suggests that Archaeopteryx was not a very strong flier, but flight muscles might have attached to the thick, boomerang-shaped wishbone, the platelike coracoids, or perhaps to a cartilaginous sternum. 


The sideways orientation of the glenoid (shoulder) joint between scapula, coracoid and humerus—instead of the dorsally angled arrangement found in modern birds—suggests that Archaeopteryx was unable to lift its wings above its back, a requirement for the upstroke found in modern flapping flight. 


Thus, it seems likely that Archaeopteryx was indeed unable to use flapping flight as modern birds do, but it may well have utilized a downstroke-only flap-assisted gliding technique. 


There are some Archaeopteryx fossils found in water areas,thus there are some theorys that Archaeopteryx uses its wing to walk in the water just like the Basilisk does.