UNCONFORMITIES Part 1: Erosion Not every place on Earth is a location where rock
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UNCONFORMITIES Part 1: Erosion Not every place on Earth is a location where rocks are being deposited. Some pla rocks are being eroded an area ces are where . The rock record is the rocks that remain that help us determine the history of 1. In which of the following environments are rocks most likely to be eroded? This e nvironment is an area where sediments are NOT deposited. Explain your r easoning. a. mouth of river b. ocean floor c. mountain d. coral reef 2. How could we tell if erosion happened in the rock record? 3. Two students are debating how erosion would be recorded in the rock record Student 1: If there was erosion, you wouldn't be oble to see it because it gets rocks. So there wouldn't be any record of it. Student 2: But, because rocks that were once there were tak missing surface at the top of the rocks. Thot missing surface record rid of I. would be visible in the rock With which student do you agree? Why? 4. In the cross section to the right, what are two things the cross section to the right, what are two things hat happened between the deposition of Sediment A and Sediment D:? 2. © w. H. Freeman and Company Lecture Tutorials for Introductory Geoscience 161Explanation / Answer
1. mountain. beacuse it is the only place where there is less of deposition and more of erosion. in all other cases there si only deposition of sediments and no erosion.
2. erosion is a force and phenomenon of nature. it is evident from observations like sidden omission of strata, loose rock fragments, weathered minerals (keolinite), absence of beds lower in sequence (older age) but presence of above beds (younger).
3. agree with stident 2 because absence of rock is the evidence of erosion.
4. 1. there was folding of beds A, B, and C
2. there was weathering and erosion of the top layers which made them horizontal from a curved (antiformal) surface.
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