Cross-bedding - Geology is the Way
Cross-bedding (or cross-stratification) is a primary sedimentary feature characterized by layers that intersect at an angle with each other through planar erosional surfaces that truncate inclined beds and laminae. This structure is the result of the migration of bedforms, such as dunes, ripples, and megaripples, produced by wind or water ...
Cross-bedding - Wikipedia
Cross-beds are layers of sediment that are inclined relative to the base and top of the bed they are associated with. Cross-beds can tell modern geologists many things about ancient environments such as- depositional environment, the direction of sediment transport (paleocurrent) and even environmental conditions at the time of deposition.
• identify cross-bedding in sedimentary rocks from photographs; • relate cross-bedding to the original conditions of deposition of the sediment; • understand the relationship between current direction and cross-bedding; • use cross-bedding to determine the directions of the ancient currents which deposited the sediments in a sequence of ...
Bedding and lamination – Geology is the Way
Cross-bedding – Cross-bedding (or cross-stratification) is a primary sedimentary feature characterized by layers that intersect at an angle with each other. In general, cross-bedding is characterized by planar erosional surfaces that separate beds with inclined strata or laminae.
Cross Bedding - University of Pittsburgh
The cross-beds reflect the steep faces of ripples and dunes. These steep faces tilt down-current and thus indicate current flow direction. Cross-beds are commonly curved at the base; this gives a handy way of determining right-side up in complexly deformed rocks.
Paleocurrent Analysis - Geology In
Paleocurrent analysis is a fascinating technique used by geologists to reconstruct the direction of ancient water currents that deposited sedimentary rocks. By studying these rocks, geologists can unlock clues about past environments, like rivers, beaches, or even deep-sea currents.
4.2: Structures Formed by Unidirectional Currents
Trough cross-beds have curved bounding surfaces that appear u-shaped when viewed in an up- or down-flow direction and scoop-shaped when viewed perpendicular to flow direction. When viewed from above, foresets in trough cross beds appear …
Lesson 6: Sedimentary Rocks Flashcards - Quizlet
T/F Cross-beds indicate that current flow changed direction and the new direction flows across the old direction at an angle.
Cross bedding and how to use it to infer way-up direction in ...
Cross bedding as a primary sedimentary rock structure to infer the way-up (younging) direction in sedimentary rocks. In the example shown, a series of cross-beds are shown and can be used...
chapter 6 Flashcards - Quizlet
Sedimentary rocks can form by each of the following processes EXCEPT by the precipitation of minerals from water solution. by the cementing together of loose grains of pre-existing rock. from shell fragments or carbon-rich relicts of plants.
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