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I.
Sedimentary rocksformed from loose sediment
(the broken fragments of other
rocks).
A. These sediments are transported,
deposited and eventually
Compacted and cemented
together. This is called
lithification.
Types of Sed. Rx

Clastic rocks are
composed of
fragments, or
clasts, of preexisting rock.
Types of Sed. Rx
Bioclastic rocks
(also called organic)
are composed of
organic debris
such as plants
(lignite, coal) or
shells (coquina,
fossiliferous
limestone).
Types of Sed. Rx

Chemical rocks:
made up from rock
fragments that are
chemical in origin
and formed from
minerals that were
once dissolved in
water.
Are all Sed. Rocks distinguishable
in only one of the groups (Clastic,
Organic, Chemical)??
Sedimentary Rock Features
 Stratification/Strata
- is the building up of
layers
Sedimentary Rock Features
 Mud
Cracks
- cracks formed by
the drying, of the
mud
Sedimentary Rock Features
 Ripple
Marks
- wavy feature
formed by wind,
wave, or current.
Sedimentary Rock Features
 Fossils
- Organic organisms
fossilized/cemented
into rock layer.