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Geology 112 Word Scramble

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