WednesdayFebruary 15, 2012

(Sedimentary Rocks; WS – Sedimentary

Rocks [Part 1])

The Launch PadWednesday, 2/15/12

No Launch Pad Today

Assignment Currently Open

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Quiz 18 S5 2/3 2/3 2/3 2/17

WS – Igneous Rocks (Part 1) F 2/9 2/13

Quiz 19 S6 2/10 2/10 2/10 2/24

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Sedimentary Rocks Sedimentary rocks form from

sediment, which is the product of weathering.

Sedimentary rocks make up about 75% of all rock outcrops

on Earth’s continents.These rocks are used to

reconstruct much of Earth’s history, as they provide clues to

past environments and sediment transport.

Sedimentary rocks often contain fossils.

Sedimentary Rocks Sedimentary rocks are

of tremendous economic importance

because they can contain fossil fuels:

coaloil

natural gas They are also sources of

iron and aluminum.

Sedimentary Rocks There are two classifications of sedimentary rocks based upon the source of the material in the rocks, detrital and

chemical.Materials accumulating as sediment have two principle

sources:Sediment may originate as solid particles from weathered

rocks, such as igneous rocks. These particles are called detritus, and the sedimentary rocks they form are called

detrital sedimentary rocks.In detrital rocks, the material is in solid particles, so

geologists use particle size to distinguish amoung detrital rocks.

Detrital Sedimentary Rocks

Detrital Sedimentary Rocks

shale(very fine particles)

siltstone(fine particles)

sandstone(medium particles)

breccia(course, angular particles)

conglomerate(course, rounded

particles)

Chemical Sedimentary Rocks There are two classifications of sedimentary rocks based upon

the source of the material in the rocks.

Materials accumulating as sediment have two principle sources:

The second major source of sediment is solid material produced largely by chemical weathering. When these dissolved

substances are precipitated back as solids, they are called chemical sediments, and they form chemical sedimentary rocks.

Chemical sedimentary rocks are derived from material that was once in solution and precipitates to form sediment.

They are either directly precipitated as the result of physical processes, or deposited through life processes (biochemical

origin.)

Chemical Sedimentary

Rocks

Chemical Sedimentary Rocks fossiliferous limestone

coquina (shell fragments)

Chalk

Agate flint

jasper

Chemical Sedimentary Rocks evaporate deposits

Worksheet

Sedimentary Rocks(Part 1)