11-10 Million Vantage member for the Ellensburg formation, a thin sedimentary unit that covers much of the western part of the plateau, was deposited.
(a thin sedimentary unit; covers; much of the western part of the plateau) (11-10 Million Vantage member for the Ellensburg formation; was deposited; )
a thin sedimentary unit 11-10 Million Vantage member for the Ellensburg formation
covers was deposited
much of the western part of the plateau