Three of the four fault blocks within the Bree Creek Quadrangle contain folded Paleogene rocks for which bedding attitudes are shown on the map. Complete the tasks listed below for each fault block. We suggest that this problem be completed by teams of three students, with each member of the team completing all the tasks for only one of the three fault blocks. Each member of the team should then make copies of his or her results so that each student on the team has data for all three of the fault blocks. These diagrams will be used in Chapter 11 for a structural synthesis of the Bree Creek Quadrangle.

1 Construct a contoured p-diagram of the folds involving Paleogene strata.

2 Using the technique shown in Fig. 7.6, construct a profile view of the folds.

3. Draw dip isogons on your profile view and determine the class of each folded layer.

4. Describe the folds as succinctly and completely as possible. Your description should include the trend and plunge of the p-axis, attitude of the axial surface, interlimb angle, symmetry, class of folds, and age of folding.

5. Figure G-20 is a reference map of the Bree Creek Quadrangle with a circle on each of the three fault blocks involved in this problem. Sketch the contour diagram for each of the three fault blocks in the corresponding circle, similar to those in Fig. 7.11c. Draw the p-axis and axial plane on each circle. Such a reference map is an effective way of summarizing the orientation and geometry of folds in separate areas.

Fig. 7.6

Fig. 7.11c

Figure G-20

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