Fossils: preserved remains, impression / traces of animals that lived millions years ago.
some fossils contain mineralised remains of organism // just an impression filled w/ minerals to produce a cast of organism.
1) mud & sand fall to sea bed. layers of sediment build up, heat, pressure covert sediment to sedimentary rock.
2) organisms die. soft tissue decomposes, leaving skeleton,
3) skeleton buried by sediment.
4) over millions of years, more fossils form. upper layers = more recent fossils
Comments
No comments have yet been made