6.3 SEDIMENTARY ROCK

SEDIMENTARY ROCK

How is sedimentary rock formed?

Compacting and cementing of layers of sediment.

SEDIMENTARY ROCK

How does cementation work?

When minerals fill the spots b/t grains and bind (glue) them together.

SEDIMENTARY ROCK

Law of Superposition - Sedimentary layers are deposited in a time sequence w/oldest on the bottom and youngest on the top.

SEDIMENTARY ROCK TYPES

Clastic Sedimentary RockClastic Rock Are formed

from fragments of other rocks through erosion.

SEDIMENTARY ROCK

How do clastics form?As material is eroded it is transported down stream w/heavier material settling out first.

SEDIMENTARY ROCK TYPES

Chemical Sedimentary RockForm when minerals precipitate (fall) out of a solution.ex. Rock salt forms from salt water solution.

SEDIMENTARY ROCK TYPES

Organic RockSedimentary rock consisting of the remains of plants and animals.

Some of these organic materials include:ClamsCoralsAlgae…

When they die their Ca rich remains pile up on the the ocean floor.

SEDIMENTARY ROCK

FEATURES OF SEDIMENTARY ROCK

Stratification – The change in the type of sediments being laid down.

FEATURES OF SEDIMENTARY ROCK

Fossils (remains, impressions or evidence preserved plant and animals) – Occurs when fossils are buried in sediments and are gradually turned into rock.