Geography

Starbuck

12 February, 16:48

You are walking north across dipping beds in sedimentary rocks. You walk across 200m of rocks with a relatively constant dip of 20 degrees to the south. Suddenly you come to beds with lower dip that become flat lying, and then dip north across a horizontal distance of only about 30m. As you walk on the beds become more steeply dipping until they dip almost 80 degrees to the north. You walk across these steeply dipping beds for 40m, and then beds return to a south dip of about 20 degrees. What kind of structure (s) did you just walk across? Make a labelled sketch that explains your answer.

A) a symmetric anticline

B) an asymmetric syncline

C) an asymmetric anticline and syncline

D) an asymmetric anticline

E) a symmetric syncline