Abstract: An apparatus for separating and sizing particulate matter, comprising a main frame, infeed conveyor, collection conveyor and a screening assembly including a frame, screen, and an underscreen conveyor mounted underneath the screen. In exemplary embodiments at least one crusher is included. The apparatus converts configuration from a transport mode to an operating mode. Material deposited onto the infeed conveyor is moved forward into the screening assembly. Material falling through the screen is deflected by a deflector onto a collection conveyor. Material passing over the screen drops into the crusher and crushed material drops onto the collection conveyor. Material on the collection conveyor is conveyed to a discharge location. The apparatus components are arranged such that material moves in a uni-directional flow through the apparatus without reversing direction. The apparatus may be mounted on a mobilizing assembly, such as one including endless tracks or wheels, for portability.