Thick layers of sand, mud, and calcium carbonate were deposited on the sea bottoms and later hardened into sedimentary rocks such as sandstone, shale, and limestone.
(Thick layers of sand, mud, and calcium carbonate; were deposited; on the sea bottoms) (Thick layers of sand, mud, and calcium carbonate; hardened; into sedimentary rocks such as sandstone, shale, and limestone; T:later)
Thick layers of sand, mud, and calcium carbonate Thick layers of sand, mud, and calcium carbonate
were deposited hardened
on the sea bottoms
into sedimentary rocks such as sandstone, shale, and limestone T:later