thpsition) in wheh the sediment forming ie rock accumulated. Examples of deposit
ID: 289383 • Letter: T
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thpsition) in wheh the sediment forming ie rock accumulated. Examples of depositional settings are listed in FIGURE 6.16, along with a simplified description of characteristics found there. Successions o are like pages in a book that record the succession of depositional environments, Further study in geology will add additional detail to this image, but even with your basic knowledge, you can interpret outcrops in the field. You will do this in Exercise 6.10. EXERCISE 6.10 Interpreting Outcrops Name: Course: Section: Date: (a) Look at the sedimentary rocks in the figures below Brief "field notes" are provided with each photograph. In each case, identify the rock and any sedimentary structures present, and interpret the depositional setting in which the rock formed. structures Interpreting sedimentary outcrops. Entrance to Zion National Park in Utah. Large cliff face containing thick beds of medium-grained white, gray, and beige sandst tones displaying excellent cross bedding Sandstone with preserved dinosaur trackway and asymmetric ripple marks. Note different orientation of ripple marks in the (continue 6.8 APPLYING YOUR KNOWLEDGE TO STRATIGRAPHYExplanation / Answer
1) the rock shown in figure is sandstone having cross bedding as sedimentary structure
Strata in which internal layers, or foresters dip at the distinct angle to the surfaces that bound the set of the cross bed are termed as starta showing cross bedding, ( they are oriented at an angle to the depositional horizontal )
They depositional environment for such beds is wind(alluvial) or water (flluvial)
2) the rocks shown here is sandstone and sedimentary structures which can be seen are assymetric ripple marks and footmarks of organisms
Assymetric ripple marks can be interpreted in explaining direction of current, footmarks of organisms can also be used in finding direction of current
Depositional environment for both these sedimentary structures is most commonly water
3) in this figure , we can observe lenticular bedding (a sedimentary structure) , which composed of isolated ripples of clay surrounded by mud,formed during periods of slack water, mud suspended in the water is deposited on top of small formations of sand once the water's velocity has reached zero.
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