GEO_416M_2011SP_1st_exam_key

GEO_416M_2011SP_1st_exam_key - GEO416M, Sedimentary Rocks,...

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GEO416M, Sedimentary Rocks, 2011 Spring Exam 1, Feb 14 - 2011, Siliciclastic Sediments and Rocks 1 Name_______________________________ UT EID______________________________ Total 48 multiple-choice questions: each question worth 2 points. 2 points awarded for turning in the paper exam questions with name and correct UT EID written on front page 2 points awarded for turning in the answer sheet with name and correct UT EID marked 1) Sedimentary deposits less than 100 million years in age make up the following percentage of all sedimentary outcrops a) less than 10 % b) between 10 and 20 % c) between 20 and 40 % d) greater than 40 % 2) Geological time scale was largely constructed from age dating of distinct sedimentary packages. Which would be stratigraphic events that define geological time periods? a) Tectonic and geochemical changes b) Extinctions c) Regional unconformities d) All of above 3) Which is correct? a) Clastic – source of particles is typically internal to the depositional basin b) Biochemical – composed of minerals precipitated by biogenic processes c) Chemical – common chemical rocks are coals d) Organic Particulate Material – common rocks are evaporates 4) The diameters of very course sand grains range between a) 2 mm and 4 mm b) 1/8 mm and 1/2 mm c) 1 mm and 2 mm d) 1/16 mm and 1/4 mm 5) The median particle size for the cumulative grain size curve in Figure 1 is a) 1.00 φ b) 1.75 φ c) 2.35 φ d) 3.40 φ 6) Which line in Figure 2 shows a sample that has the coarsest median size? a) 1 b) 2 c) 3 d) 4 7) Which line in Figure 3 represents the most well-sorted grain size distribution a) 1 b) 2 c) 3 d) 4 8) Which is NOT correct about skewness a) River sand is typically fine-skewed because fine sediment is carried in suspension b) Lag surface (as in deserts) are coarse-skewed as fine sediment is deflated c) Beach sand is typically coarse- skewed because of wave reworking d) Offshore suspension deposits tend to be fine-skewed 9) Which is NOT correct about Kurtosis a) Similar to sorting showing dominance of center and ends of population b) Low Kurtosis value – well sorted with concentration of population c) Indicates transport history and depositional processes d) Bimodal distributions are platykurtic, typically reflecting mixing of environments
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GEO416M, Sedimentary Rocks, 2011 Spring Exam 1, Feb 14 - 2011, Siliciclastic Sediments and Rocks 2 10) Which are correct systems for A and B in Figure 4 a) A – River, B – Beach b) A – Beach, A – River c) A – Aeolian, B – Glacier d) A – Glacier, B – River
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GEO_416M_2011SP_1st_exam_key - GEO416M, Sedimentary Rocks,...

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