Mrs. Storiz Sedimentary Rocks

Created by saa Plus

Upgrade to
remove ads

Sedimentary Rock samples

sediments

materials that settle out of water or air.
Some can contain pieces of plant or animal remains.

coal

an unusual sedimentary rock that forms from plants instead of earlier rocks. Formed millions of years ago in swamps.

clastic sediments

make up >75% of all sediments on the earth's surface.

chemical precipitates

Minerals that are precipitated from concentrated solutions.

Biogenic sedimentary rocks

Sediments that are produced through the life activities of plants and animals. (sometimes called biochemical)

boulder

> 256 mm

cobble

256 - 64 mm

pebble

64 - 4 mm

granule

4 - 2 mm

sand

2 - 1/16 mm

silt

1/16 - 1/256 mm

clay

< 1/256 mm

conglomerate

Sediment Type: clastic
Grain Size: gravel
Common Sedimentary Environments: river channels, glacial till, alluvial fans

Breccia

Sediment type: clastic
Grain Size: gravel
Common Sedimentary Environments: near-surface faults or near sediment source areas
Angular clasts

sandstone

Sediment type: clastic
Grain Size: sand
Common Sedimentary Environments: beach, desert

mudstone

Sediment type: clastic
Grain Size: silt and clay (mud)
Common Sedimentary Environments: low energy environments such as lakes, deep ocean, flood plains, and deltas

shale

Sediment type: clastic
Grain Size: silt and clay (mud)
Common Sedimentary Environments: low energy environments such as lakes, deep ocean, flood plains, and deltas.

chert

Sediment type: chemical/biogenic
Composition: quartz
Grain Size: microscopic
Common Sedimentary Environments: groundwater precipitate or deep-marine biogenic accumulations

Rock Salt

Sediment type: chemical
Composition: halite
Grain Size: mostly fine grained
Common Sedimentary Environments: desert lakes and marine areas with high evaporation rates

Rock Gypsum

Sediment type: chemical
Composition: gypsum
Grain Size: variable, commonly fibrous or granular and medium to fine grained
Common Sedimentary Environments: desert lakes and marine areas with high evaporation rates (often forms in same environment as rock salt)

Travertine

Chemical sedimentary rock.
Generally banded.
Usually very fine grained.
Formed in caves.
Composition: calcite.

Limestone, chalk

Formed by the accumulation of microscopic marine calcite fossils.
Biochemical sedimentary rock.
Very fine grained.
Composition: calcite.
Environments: marine

Fossiliferous limestone

Biochemical.
Formed by the accumulation and consolidation of macroscopic calcite fossils.
Composition: Calcite.
Medium to coarse-grained.
Environments: warm, shallow, marine areas.

Oolitic limestone

diatomite

Biochemical sedimentary rock.
Composed of mainly skeletons of common marine plankton- diatoms.
The skeletons are composed of silica-dioxide.

bituminous coal

Formed by the accumulation of plant material.
Composition: carbon rich.
Very fine grain.
Found in swamps.

anthracite coal

Sometimes called "hard coal".
Forms from bituminous coal when great pressures developed in folded rock strata during the creation of mountain ranges.
Has the highest energy content of all coals.

lignite

Lowest rank of coal.
Increased pressures and heat from overlying strata causes buried peat to dry and harden into this.
Is a brownish-black coal with generally high moisture and ash content and lower heating value.

coal - peat

A mass of recently accumulated to partially carbonized plant debris.
This material is on its way to becoming coal but its plant debris source is still easily recognizable.

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording

Create Set