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Rock Layers

Rock Layers. Compaction. Happens when pressure is applied to a material (over long periods of time). Cementation. Involves the deposition of a cementing matrix in the pore spaces between the grains of sediment. Before cementation (notice the air spaces). horizontal. Level- like a floor

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Rock Layers

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  1. Rock Layers

  2. Compaction • Happens when pressure is applied to a material (over long periods of time)

  3. Cementation • Involves the deposition of a cementing matrix in the pore spaces between the grains of sediment

  4. Before cementation(notice the air spaces)

  5. horizontal • Level- like a floor • Not higher on one side or the other

  6. Principle of Original Horizontality • Each new deposit of sediment forms a new horizontal layer on top of the layer below

  7. PRINCIPLE OF ORIGINAL HORIZONTALITY • • Sedimentary and extrusive igneous rocks are originally laid down in horizontal layers • • any change from that is viewed as a disturbance of those layers (something happened later) • folding, tilting (occur during mountain-building events, for example) • sedimentary and igneous extrusive rocks that are folded or tilted must have first been deposited in horizontal layers before being folded or tilted. • 1. layer deposited • 2. layer deposited • 3. layer deposited • 4. all three layers are tilted Label the above (1-4)

  8. Uniform • The way things happen today is the same way things have always happened

  9. Uniformitarianism • Means that the present is the key to the past

  10. http://sln.fi.edu/fellows/payton/rocks/create/sediment.htm

  11. Sedimentary Rock

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