Aim: How do sedimentary rocks form?

Do Now: Using your ESRT page 6, list the type(s) of rocks that can

become sedimentary rocks.

Describe what is found in the rock? How did it get there?

How do sedimentary rocks form?

Land-Derived (Clastic) Sedimentary

Rocks

How are land-derived sedimentary rocks formed?Land-derived Clastic

Sedimentary rocks form by:• Weathering- rocks break down into

smaller pieces called sediment. • Erosion- Sediments are transported

by wind, water, ice, or gravity.• Deposition: sediments are dropped

and buried• Compaction: overlying sediment

apply pressure and squeeze sediments together

• Cementation – natural “glue” of dissolved minerals in water that binds grains of sediment together

Lithification

How else can sedimentary rocks form?

How are sedimentary rocks formed chemically or organically?

• Chemical / Crystalline – minerals come out of solution by precipitation or evaporation, leaving crystals behind.

Ex. When saltwater evaporates rock salt

• Organically / Bioclastic- formed from organic matter such as plant or shell remains.

Ex. Coquina or limestone

How are the sedimentary rocks classified on page 7 of the ESRT?

MARINE/

Formation Process

Com

pact

ion

&

Cem

enta

tion

(Lith

ifica

tion)

Pre

cipi

tatio

n &

E

vapo

ratio

n

Lithification shell / plant fragments

According to the texture, Identify the two major groups of sedimentary rocks?

1. Clastic rocks – fragments of rocks compacted & cemented together

How do we differentiate between clastic and nonclastic rocks?

2. Non-clastic rocks – made from dissolved minerals or plant / shell remains (no sediments)

Clastic and Nonclastic rocks

*** Clastic rocks are classified by their grain size ***

Determine the characteristics that can be seen in these sedimentary rocks?

**ONLY Sedimentary Rocks contain Fossils**

Layers

Rain-drop impressions

Rock Fragments

Mud cracks

FOSSILS

Summary Activity ESRT page 71. Why are sedimentary rocks the only rock

types that contain fossils?2. How can sedimentary rocks form?

Extra Summary Questions