Geology Final - Geologic Structure

What type of unconformity is shown in each block diagram?

1 - Disconformity 2 - Disconformity 3 - Angular unconformity 4 - Nonconformity

Part 1.a. Block 1 shows a vertical fault cutting across a nonplunging syncline. What type of fault is this? Transform Fault Part 1.b. Block 2 shows a dip-slip fault. What type of fault is this? Normal Fault

1 - Transform Fault 2 - Normal Fault

What is the structure that you've drawn in the block diagram?

Anticline

Part 1.b. Using the principle of cross-cutting relationships [if one rock cuts across another, it must be the younger rock (see Chapter 12 for more on cross-cutting relationships)]. List the sequence of intrusions for block 1. (from oldest to youngest)

BAC

Are the strata along the hinge of the anticline younger or older than the strata on the exposed part of the limbs, as seen in the map-viewed surface?

Older

1) The center of a dome exposes (older/younger) strata relative to its outer edge. 2) The center of a basin exposes (older/younger) strata relative to its outer edge

Older/Younger

Match the letters on block 1 to the type of intrusion:

Pluton, Sill, Dike

In Block 3, in which direction are the post-unconformity strata dipping? [i.e. what is the cardinal direction of the dip of the bedding?

Southeast

In the figure, which of the block diagrams illustrates a basin and which illustrates a dome

The leftmost picture is a Dome , the rightmost picture is a Basin .

Are the strata along the hinge of the syncline younger or older than the strata on the exposed part of the limbs, as seen in the map-viewed surface?

Younger