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13 Cards in this Set
- Front
- Back
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fan shaped depositions of sediments at the base of mountains or canyons |
Alluvial fans |
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where two or more alluvial fans coalesce |
bajada |
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Alluvial fans and bajadas are two features associated with |
flash floods in mountainous deserts. |
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barchan dunes
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crescent shaped with horns that point downwind
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How do barchan dunes form?
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form on planar, relatively hard surfaces with limited sand supply and constant wind direction
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transverse dunes
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crests that are linear to sinous and oriented perpendicular to the prevailing wind direction
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parabolic dunes
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crescent or parabolic-shaped dune in which the horns or tips point upwind.
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longitudinal dunes
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long narrow dunes that are aligned parallel to the average prevailing wind direction
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How are longitudinal dunes formed?
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develop when wind alternates from two different directions blowing with equal force and frequency
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the youngest layer is at the top and oldest is at the base
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law of superposition
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law of cross-cutting
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a dike that cuts across another is rock is younger
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law of inclusion
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the source rock that eroded is to produce a clast is older than the layer where the clast is embedded
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law of continuity |
stratum extends laterally in all directions |
