As these sediments piled up, their great weight pressed them into hard, compact beds , or layers, of sedimentary rock (See ROCK [Sedimentary Rock]).
(these sediments; piled up; ) (their great weight; pressed; them; into hard, compact beds , or layers, of sedimentary rock (See ROCK; T:As these sediments piled up)
these sediments their great weight
piled up pressed
them into hard, compact beds , or layers, of sedimentary rock (See ROCK T:As these sediments piled up