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These gaps represent a missing period in our relative time scale.
An angular unconformity occurs when rocks are tilted, then eroded and then new sediment is deposited on top.
Faults can offset layers which tells us that the fault happened after the layers was deposited.
If magma intrudes, creating a sill, we know that the sill is younger than the layer above and below, because the layers already had to exist in order for a sill to be formed.
A nonconformity occurs when igneous and metamorphic rocks are exposed due to uplift, eroded and then sediments are deposited on top.
Showing top 8 worksheets in the category - Relative Dating Answer Key.
We already know that sedimentary rocks are formed by sediments being horizontally deposited. Bottom layers remain unseen to us until tectonic processes or weathering and erosion make them visible.
Cross-cutting relationships states that any feature that cuts across a body of rock is younger than the rock that it cuts across.
For Monday, March 2, due to the weather conditions East Ramapo will have a 2 Hour Delay.
No AM half-day Kindergarten and all before school activities are canceled.