In the Latest Devonian to Mississippian periods, Ural Ocean became a seaway. Until the three collided in the Carboniferous, it created the Ural Mountains, completely closing the ocean, and forming the Pangaea supercontinent.
During the Late Devonian to Mississippian periods, the Ural Ocean transitioned into a seaway.  Prior to colliding in the Carboniferous period, it formed the Ural Mountains, which completely closed the ocean and contributed to the formation of the Pangaea supercontinent.