§6-1 “ Sedimentary Rock” First Go over Chapter 5 interactive notes & then:

Objectives: Name the 3 main types of sedimentary rock & give an example of each. Describe several identifiable sedimentary rock features.

Formation of Sedimentary Rocks Compaction of sediments –Weight of overlying sediments “squishes” the fragments together. Cementation of sediments –By quartz or calcite

3 Types of Sedimentary Rocks #1 CLASTIC #2 CHEMICAL #3 ORGANIC

CLASTIC Sedimentary Rocks Classified by the size of the sediments within the rock Rounded pebbles – –Conglomerate Angular gravel – –Breccia Visible pieces of sand – –Sandstone Clay/mud particles – – Shale   

CHEMICAL Sedimentary Rocks Formed from minerals that were dissolved in water  Precipitation  Calcite, Chemical Limestone  Evaporation  Gypsum, halite 5/6 & 7/8 start here

Organic Sedimentary Rocks Formed by once-living organisms Examples: –Coquina Large sea shells –Chalk Microscopic Sea shells –Coal dead plants in swamps –Organic limestone Fossils Coral

Sedimentary Rock Structures Stratification Ripple Marks Mud Cracks Fossils Concretions 3 rd period start here on Monday

Stratification

Ripple Marks

Mud Cracks

Fossils

Concretions

Assignments Work in small groups to separate your “Box of Rocks” into 3 groups: 1- Clastic = Pieces 2- Chemical = minerals from water 3- Organic = fossils, coral, seashells, coal Can you name each rock? Wash your hands/table & leave box of rocks on your table. Begin working on Chapter 6 interactive note sheets.