EARTH238-2b- Primary Structures Part 2

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11 Terms

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Types of contacts

depositional contact, fault contact, intrusive contact

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Comfortable Contact

Depositional; more or less continuous deposition, no substantial gap in time

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Uncomforable contact (uncomformity)

Not continuous deposition, substantial gap in time

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Hiatus

gap in time represented by an uncomformity

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Angular uncomformity

strata below unconformity have a different attitude than the strata above

<p>strata below unconformity have a different attitude than the strata above</p>
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Disconformity

beds of the rock sequence below uncomformity are parallel, but measurable age difference between the two

<p>beds of the rock sequence below uncomformity are parallel, but measurable age difference between the two</p>
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Noncomformity

strata deposited on the basement of older crystalline rocks

<p>strata deposited on the basement of older crystalline rocks</p>
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Pressure solution

process which soluble grains preferentially dissolve along the faces at which stress is the greatest

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styolites

serrate surfaces at which minerals have been removed by pressure dissolution in a process by decreasing a total volume of rock

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Primary igneous structures

magma emplaced either on surface(extrusive) or within the crust(intrusive rocks), felsic and mafic

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Cooling fractures

columnar jointing, associated with shallow intrusions and extrusive flows, hexagonal.

<p>columnar jointing, associated with shallow intrusions and extrusive flows, hexagonal.</p>