EES 2021 Sedimentary Environments • Name x Please read all questions carefully. The exam is worth 100 points+3 extra credit. Good Luck! Useful Relationships:  = – log2D Please use Chat for questions Answer inside boxes using 12-point font I. Slide Interpretation (8 points total). Alkali Feldspars 1. a) Name a sandstone with 80% feldspar b) Which depositional setting will be dominated by such lithofacies (insert one letter)? b B C A D 2. a) What type of bedform is shown on this slide: (use bold for one correct answer) 2D ripples 3D megaripples b) The flow direction is: 2D sandwaves 3D ripples 2D megaripples c B A D l = 5.5 m C II. True or False. Read every word and use bold for T only if the entire statement is true. (20 points) F 3. Conglomerates and calcirudites are important petroleum source rocks F 4. Amazon has the highest QS in the world T 5. Coastal dunes tend to have more positive skewness than beaches T 6. Paraconformity represents a period of non-deposition F 7. Fluvial facies sequence is inversely graded (coarsens upward) F 8. Due to its stability, quartz is an ideal mineral for forensic investigation F 9. Planar cross-bedding is a good for paleo-current and geopetal indicator T 10. Soil is a product of erosion over long period of time T 11. Rocks (or sediments) with identical body fossils belong to the same biofacies T 12. Pisosparite is an example of siliciclastic sedimentary rock III. Multiple Choice. Choose only one correct answer and write it in the box at left. (18 points) 13. 14. 15. 16. 17. 18. b e c b c c This scientist related conformable stratigraphy to depositional environments: A. Smith C. Lyell B. Walther D. Gressly E. Steno What is the best example of a very well-rounded, non-spherical particle: A. Pellet C. Basketball B. Porcupine D. Ooid E. Pisoid Which compositional components increase as mean grain size decreases: A. Feldspar C. Clay B. Silt D. Quartz E. Rock fragments A depositional setting in which calcilutite is deposited adjacent to basalt: A. Fringing reef C. Barrier reef B. Oyster reef D. Atoll E. Cave Choose a particle that will fall first (fastest) out of suspension: A. 2.6  magnetite C. 2.6  quartz B. 2.7  magnetite D. 2.8  quartz E. 2.7 m quartz The coarsest facies in a braided stream sequence represents: A. Point Bar C. Oxbow B. Longitudinal bar D. Transverse bar E. Cutbank IV. Short Answers. Use only space provided under each question. (26 points) 19. Name any three lithofacies you will find seaward of a Bahamian beach: (6 points) 1) Shales 2) Greywacke 3) Litharenite 20. Getting particular (pay attention to units!): (8 points) no calculator needed, but you can use one 1) Sand/gravel boundary = -1 m 3) The Antarctic polar circle is 66 S 2) 3  =  4) Mode on the graph at right = cm  1 4 8 mm 21. You were born during this geologic Period: (2 points) Cenozoic Era 22. It’s all in the name… Name the rock based on the following information. (10 points) Be as specific as possible 1) 3% clay, 97% sand (with Q=96%) sand 2) oyster fragments cemented by calcite Limestone 3) 72% sand (L=60%), 28% mud 4) in-situ coral reef block 5) mud-sized carbonate microfossils VI. Diagrams (6 points each, 18 points total). 23. How mature is it? Using the area below, label the four classes (stages) of textural maturity in the header (green boxes) and indicate the key steps required to produce each maturity class (blue boxes). Removal of clays Sorting of the sand fraction Attainment of high roundness 24. Flute and Ripple: On this mudstone surface, draw a flute mark (depression) consistent with a flow to the east and a 2D ripple consistent with a flow to the south. Use Insert → Shapes→ Ovals to draw contour lines. North 25. Rosy Picture: On rose diagrams below show orientations of herringbone crossbedding for: 1) tides flowing NW-SE and 2) dunes driven by south wind. Use Insert → Shapes→ triangles. 1) CROSS-BEDDING North 2) DUNES VII. Short Essay (10 points). Using words only, describe how a regressive sequence is produced at the mouth of the Mississippi river (use lithofacies and bedset terms you learned in class). This sequence is (bold one): fining-upward uniform coarsening-upward Extra Credit (3 points): This river has a delicate margin due to sea ice protection: Mississippi River 
Purchase answer to see full attachment