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Relative Age is its age compared to the ages of oter rocks
Abosolute Age is the numberof years since the rock formed
Law of Superposition to determine the relative ages of sedimentary rock layers
The Law of Superposition in horizontal sedementary rock layers the oldest layer is at the bottom. Each higher layer is younger than the layers below it.
Determining Relative Age geologists also study extrusions and intusions of igneous rock, faults, and gaps in the geologic record.
extrusion Lava that hardens on the surface
Intrusion magma cools and hardens into a mass of igneous rock
fault a break in the Earth's crust
Unconformity A surface where new rock layers meet a much older rock surface beneath them
Index Fossil a fossil must be widely distributed and represent a type of organism that existed only briefly
Why are Index fossils useful they are useful because they tell the relative ages of the rock layers in which they occur
what steps are needed in order conformity to happen? Step: 1 Sedimentary rocks form in horizontal layers. Step: 2 Folding tilts the rock layers. Step 3: The surface is eroded. Step : 4 new sediment is deposited, forming rock layers above the undonformity.
Geologic time scale a record of the life forms and geologic events in Earth's history.
era Geologists divide the time between prcambrian time and the present into three long units of time
periods eras are subdivided into units of geologic time
name Three Eras Paleozoic, Meszoic Cenozoic
Where do the names of geologic periods come from Places from around the world where geologists first described the rocks and fossils of that period
Created by: Loterewl
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