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An unconformity is a gap in time of the rock record. In a stratigraphic column this is evidence that erosion has removed a portion of the natural deposition of sediment in an area.
In a disconformity erosion takes place between sedimentary rocks that have not been otherwise modified.
In an angular unconformity, previous bedding has been tilted from its original deposition and undergone erosion, and is topped by new sediment that is deposited horizontally on top of this tipped surface.
In a nonconformity, huge amounts of erosion have exposed igneous or metamorphic basement rock and there is an igneous or metamorphic rock contacting sedimentary rock.
Wiki User
∙ 12y ago
Wiki User
∙ 12y agoUnconformities are geologic areas where erosion has been buried by later sediment.
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What are missing rock layers known as?
Unconformities. =)
Which is not a type of unconformity?
Anything that is not a nonconformity, angular uncomformity, and discomformity
Which kind of uncomformity has an erosional surface between parallel strata?
disconformity
When a layer or several layers of rock are missing from a rock layer sequence this is called a what?
It is called an uncomformity.
When the surface of new rock layers meet a much older rock beneath them what is it called?
Uncomformity
What can you guess about the environment at the time an uncomformity was forming?
Sediments were not deposited in the location, erosion removing a layer of rock after it formed.
What occurs when sedimentary rocks are deposited on top of uplifted and eroded metamorphic or igneous rocks?
An uncomformity will occur in the rock record.
A break in the rock record deposition of sediment has been interrupted is referred to as a?
A gap in the geologic record of rock formations is called an uncomformity.
Where in the sequence of events is the formation of an uncomformity?
An unconformity is a gap in the sedimentary rock record. This animation shows the formation of an angular unconformity-one where the layers above and below the unconformity are not parallel to each other, but form an angle.
Why are igneous rocks the best type of rock sample for radiometricdating?
you can easily find zircon in them which was formed exactly as the entire rock under study,unlike in a sediment zircon might have been deposited say may be after or before an uncomformity that is if it took place
Weathering and erosion break down rocks and slowly create what?
Unconformities in the rock layer. To expand: Eventually. The upper rocks have to be deposited on the original, eroded surface to create the uncomformity.
What is a gap in the rock record caused by erosion?
Any gap in age of rock between rock layers is called an uncomformity. An unconformity is the contact between two layers representing a gap in the geologic record, usually from the erosion of the layers which would normally be expected to appear.
