Form from the compaction and cementation of pieces
of other rocks (sediments) that have been weathered,
eroded & deposited on the earth’s surface.
Things you will need to know about SEDIMENTARY ROCKS :
Form in flat layers called “strata”
Show ripple marks and mud cracks
Soft rocks, b/c they are loosely bonded together.
1. Sediment shape can indicate the environment of formation.
a. Angular Shape: Windy & Dry Climate
b. Rounded Shape: Moist Climate
2. Types of Clastic Rocks:
Identified by GRAIN SIZE… shape decides
when the grain size is equal
1. Conglomerate: Pebbles, Cobbles or Boulder size
and Rounded sediments
2. Breccia: Same size as conglomerate, but
angular shaped fragments
3. Sandstone: Fine to Coarse Sized Grains (0.2-0.006 cm)
4. Siltstone: Very Fine Grain Sizes (0.006 – 0.0004 cm)
5. Shale: Made from clay / colloidal suspensions
Non-Visible Grains (less than 0.0004cm)
3. Crystalline (Chemical)
1. When sea water evaporates, the dissolved
minerals in the water precipitate out (fall out)
2. Bioclastic: (Bio = Organic = Living)
Rocks that are created from the remains of
partially decayed plant and animal matter.
Limestone: Skeletal remains of marine animals
Chalk: Microscopic skeletal remains
Coal: forms from decaying plants
Formation of Oil and Gas
Which letter is
which is Breccia?