Slope Hazards Lab Help Problem 1: All questions are regarding the geologic map found on pages 60 & 61. General: The map on p. 60 includes both topographic contour lines and an overlay of patterns that represent different types of rock formations. Descriptions of the rock formations are on p. 61. Read the descriptions carefully to determine which types might be strong and which might be weak. The rocks units are represented by a distinct pattern and by a letter designation. a. Geologic Ages are written in all caps, vertically on the right side of each descriptive column. b. Answer: Erosional unconformity. c. See which patterns cover the most (an least) area, then use the key (p. 61) to determine what types of rock those patterns represent. d. Use the descriptions on p. 61 and what you know about the various rock types. e. The reservoir is near the center of the south 1/4 of the map. Remember the math question about reservoirs from last week? What is likely to result in the reservoir filling in quickly? (Look at your answers to c. and d.) f. Steep or Gentle? (no need to calculate the exact angle) What pattern(s) cover most of the slope? What rock type(s) do they represent? g. Look at the description of Qal on p. 61. h. Newry is in the SW corner of the map. Look at the description of Db on p. 61. i. The town is on top of a steep slope made of these materails. Look at the description of Sc and Smk on p. 61. j. The track are on near the center of the map just south of the reservoir discussed in e. k. Consider the rock types that comprise the valley walls in the wide part of the valley vs. the narrow part of the valley. l. Wrap up what you have used to assess the slop stability for the rest of the questions, they are adding in dip, which is the direction in which the rock layers tilt. Back to 1007 Lab Help |