With a tick or a cross mark which of the following are the correctly written and which are incorrect?
A correct measurement must not be ambiguous. A strike/dip (for a planes) must not be confused with a line (trends/plunges).
On a separate sheet of paper, make three columns. The first column should
be the readings as given below, the second should be the correct strike/dip
or trend/plunge reading (if correction is necessary), and the third column
should be used to explain your reasoning for the corrections.
N25NE/30 N10E/0 N30E/80
S30E/30NW W/15S N70E/92NW
N15W/35SW 325/12E 010/30
115/70SE 410/90NW 10/60NE
110/100N 300N/30 70/13NW
370/113 180/90 270/90N
N30E/-30 N45E/45SE
PART 2- GEOLOGICAL CROSS-SECTION - MAP 1
Draw cross-sections across the attached maps and answer all the included questions.
1. Map 1 Geological cross-section through marked topography and beds with horizontal dip
2. Map 2 Geological cross-section across horizontal topography cutting equally inclined beds
3. . Map 3 Geological cross-section through gentle
topography and beds of low dip
Note: All cross-sections:
(1) Must have an accompanying Geological Legend and a stratigraphic column (vertical section).
(2) Geological units must be colored in (T.A.'s will show how)
(3) Must show: vertical, horizontal scales, vertical exaggeration and orientation.
(4) Final cross-sections must be neatly done and inked in. Hand in all intermediate stages of your work leading to the final cross-section.
Teacher's notes
Students can use either bearing or azimuth:
Bearing is measured in degrees E or W from N or S
Azimuth is measured in degrees clockwise from north
Lines are measured with a trend/plunge and planes are measured with a strike/dip.
If numbers can go from 0-360
Show an overhead + handout of geological symbols shown in Ch.3 of Davis.
Explain key elements of a stratigraphic column: vertical scale, sedimentological symbols,
horizontal scale as grain size.