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AIM: How are Sedimentary Rocks Formed? Do Now: Take out your ESRT and turn to page 7. Look at the chart called Scheme for Sedimentary Rock identification and answer the questions below. 1) What textures of Sedimentary rocks will we be working with? 2) What material (not composition) are Clastic rocks made from? I. Formation of Sedimentary Rocks - mostly made from sediments (small pieces of other rocks). - as well as once living things and precipitates. Bioclastic Limestone Rock salt Conglomerate II. How are Sedimentary rocks made? What materials do you need to make most Sedimentary Rocks? • Weathering - breaking down of rocks into small pieces (sediment) • Erosion - transportation of sediment by water, wind or ice (agents of erosion). • Deposition - When the sediment stops moving because the agent of erosion stops. • Compaction and Cementation (Lithification) – squeezes (from material on top) and glues (minerals) sediments together forming a rock. Sediments are lithified into clastic sedimentary rock III. Classification of Sedimentary Rocks A. Clastic (fragmental) – composed of small peices of rocks. - Categorized by particle (grain) size. Siltstone (silt) Sandstone (sand) Conglomerate and Breccia (Pebbles) Shale (clay) B. Crystalline (Chemical precipitates)– - water evaporates and leaves material behind to form rocks (like minerals). - rocks have a milky or crystalline appearance Limestone Rock salt C. Bioclastic - composed of once living things (plants and shells). Limestone Limestone Bituminous Coal IV. Features of Sedimentary Rocks 1. Layers – continuous depositions of sediments causes a layering effect. (like sand art) 2. Fossils – imprints of ancient life. Closure: - Take out your Review Books and work on pages 62-63 # 1-10 1. 3 2. 4 3. 2 4. 4 5. 2 6. 4 7. 4 8. 2 9. 4 10. 4 Take Sedimentary Rock packet from the back Homework bin. Set I is your homework. Also, take a blue Sedimentary Rock Lab from the top do now bin and work on the pre-lab discussion questions. Take a black cup of rocks from the back of the room