notes sedimentary rocks

Document Sample
notes sedimentary rocks Powered By Docstoc
					SEDIMENTARY ROCKS:
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 :

  Have fossils!!!
  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)

 Rock Gypsum
 Rock Salt
 Dolostone
Limestone (Sometimes)
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
                    Clastic
                    Fragmental
                    Rocks




Which letter is
Conglomerate and
which is Breccia?
Crystilline Chemical
       Gypsum




                       Bioclastic
                             limestone

				
DOCUMENT INFO
Shared By:
Categories:
Tags:
Stats:
views:2
posted:10/28/2011
language:English
pages:15