Most fossils are found in sedimentary rocks, which: Form when new layers of sand and mud settle to the bottom of seas, lakes, and marshes, covering and compressing older layers into rock (e.g. sandstone and shale).
(Most fossils; are found; L:in sedimentary rocks; T:when new layers of sand and mud settle to the bottom of seas, lakes, and marshes) (new layers of sand and mud; settle; to the bottom of seas, lakes, and marshes)
Most fossils new layers of sand and mud
are found settle
L:in sedimentary rocks T:when new layers of sand and mud settle to the bottom of seas, lakes, and marshes
to the bottom of seas, lakes, and marshes