rock layers
Post on 30-Dec-2015
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Cementation• Involves the deposition of a cementing
matrix in the pore spaces between the grains of sediment
horizontal
• Level- like a floor
• Not higher on one side or the other
Principle of Original Horizontality
• Each new deposit of sediment forms a new horizontal layer on top of the layer below
• 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)
Uniformitarianism
• Means that the present is the key to the past
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