Bedding Planes - Field Geology - Assignment, Exercises of Geology

The key points in this assignment are Bedding Planes, Parallel Bedding, Planes, Sedimentary Deposits, Formations, Ground Surface, Flat Surface, Sea Level, Coordinates, Geologic Map.

Typology: Exercises

2012/2013

Uploaded on 07/18/2013

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1. Consider a sequence of perfectly parallel bedding planes defining a series of sedimentary deposits,
Formations A, B, C, D etc which strike exactly N-S, dipping to the east at 15°. Formation A is the
youngest.
Assume that the ground surface is flat and horizontal (i.e. eroded perfectly flat after the beds were
deposited and later tilted). The elevation of this flat surface is 500 m above sea level.
The following sketch is provided so that you’ll all use the same x & y coordinates (Northing & Easting)
a) Assume each bed is exactly 20m thick and sketch a geologic map, labeling each formation.
Show the scale of your map.
b) Draw an east west cross-section at the same horizontal scale and with no vertical
exaggeration (i.e. “natural scale”). Draw the map again with 10x vertical exaggeration.
c) Okay now let’s go to the real world where the ground surface isn’t a perfect horizontal plane.
Draw a geologic map if the ground surface is defined by the contour map on the following
page.
(Hint, you might need to make a series of cross-sections and then assemble your map.
N
E
600 m
Top of Fm A
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1. Consider a sequence of perfectly parallel bedding planes defining a series of sedimentary deposits,

Formations A, B, C, D etc which strike exactly N-S, dipping to the east at 15°. Formation A is the

youngest.

Assume that the ground surface is flat and horizontal (i.e. eroded perfectly flat after the beds were

deposited and later tilted). The elevation of this flat surface is 500 m above sea level.

The following sketch is provided so that you’ll all use the same x & y coordinates (Northing & Easting)

a) Assume each bed is exactly 20m thick and sketch a geologic map, labeling each formation.

Show the scale of your map.

b) Draw an east west cross-section at the same horizontal scale and with no vertical

exaggeration (i.e. “natural scale”). Draw the map again with 10x vertical exaggeration.

c) Okay now let’s go to the real world where the ground surface isn’t a perfect horizontal plane.

Draw a geologic map if the ground surface is defined by the contour map on the following

page.

(Hint, you might need to make a series of cross-sections and then assemble your map.

N

E

600 m

Top of Fm A

North 600m

500

400

300

200

100

0 100 200 300 400 500 600 700 East 800 m

520 510 m^500500 480 470 460 m

4. Consider the Geological Map of Figure 2. (Note the symbols for strike and dip are a little different

than in the notes. The symbol →15 is equivalent to ├ 15. The contours shown are ground

elevation.

a) Consider the map and describe the main structural feature present. Label this feature

on the map with the appropriate symbol.

b) Construct an east-west cross-section from point A to point B. Use a vertical

exaggeration of 2:1.

c) There has been vertical displacement in the fault in the NE area of the map. Indicate the

relative displacement (up/down) on the map.