Laboratory Manual for Introductory Geology 4e

FIGURE 10.4 Block diagrams.
Map view
Front cross-section face
Side cross-section face
(a) Construction of a block diagram.
(b) A block diagram of three horizontal layers
of strata represented by different colors.
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(c) A canyon cut into horizontal strata.
(d) A block diagram of east-dipping strata.
EXERCISE 10.4
Portraying Tilted Strata on a Block Diagram
Name:
Course:
Section:
Date:
(a) On the block diagram template below, sketch what a sequence of three layers would look like if their contacts had
traces that trended north–south on the map view and dipped to the west at about 45°.
N
(b) On the block diagram template below, sketch what a sequence of three layers would look like if the traces had an
east–west trend and dipped south at about 45°.
N
(c) On the block diagram template below, sketch what a sequence of three layers would look like if the traces had a
northeast– southwest trend and the layers dipped to the southeast at about 45°. (Hint: This is a bit trickier, because
tilt appears in both cross-section faces.)
N