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1.2 Dating methods used by geology

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Question
Answer
Stensens 5 principals?   Superposition, horizontality, lateral continuity, intrusive relationships, included fragments  
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Smiths Principal?   faunal succession  
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Def. superposition   Younger layers of sed. rocks are depositited at the top.  
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Def horizontality   If rock layers are inclined they have titled afterwards  
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def lateral continuity   sedimentary rocks form extensive sheets  
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def intrusive relationships   When igneous rocks cut through layers of sedimentary rocks, the sed rocks must have been present  
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def included fragments   If fragments of a rock are found in a a larger rock, it is said that the fragmented rock was formed first  
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def faunal succession   sed. rocks of a particular age have different fossils to sed. rocks of a different age, due to the changing biosphere  
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3 Major Eons?   Phanerozoic 0 - 0.5 Ba, Proterozoic .5 - 2.5 Ba, Archaoezoic 2.5 - 4 Ba  
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3 Eras of the Phanerozic?   Cenozoic Mesozoic Palaeozoic  
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P C D S O C   Permian, Carboniferous, Devonian, Silurian, Ordovician, Cambrian  
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Who named P C D S O C?   Sedgewick and Murchison  
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