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Rule of V’s and Simple Maps
Geology 3061
Lab 5 – Homework
1. Complete the basic map as an in-class exercise. Construct a complete, colored geologic
map using the following topographic map (Fig. 1), and the following information:
(adapted from Ragan, D.M., 1985). Turn in a .docx file explaining in detail how you
made the map for Fig. #1, and explaining whether the contact between the Permian
strata and the Triassic strata is conformable. You may need to refer to the International
Stratigraphic Chart. This must be your own work. Be prepared to explain your workflow
to Lori or I before you leave lab.
i Point A is the base of an Early Triassic (Induan Age) marine sandstone. The strike
and dip of the unit is N60i E, 20i SE. The sandstone is underlain by a Middle
Permian (Roadian Age) conglomerate that is 500 meters thick.
i Point B is the eastern boundary of a 10m thick Late Jurassic (Tithonian Age) basaltic
dike. The strike and dip of the dike is N20i W, 90i
.
i Point C is the base of a horizontal sequence of a Late Cretaceous (Maastrichtian Age)
shales and carbonates. Determine the thickness of this unit, and include your analysis
in your .docx file.
i Point D is the base of a horizontal sequence of conformable Tertiary (Paleocene –
Danian Age) shales.
i Point E is an unconformity surface that has an orientation of N80i E, 15i SE. There is
Middle Jurassic (Bathonian Age) conglomerate above the unconformity, that has the
same strike and dip as the unconformity. The upper conglomerate is 250 meters thick.
Your map should be drafted on a separate sheet of tracing paper. Ink in all of the contacts,
and color in all of the units to complete the map using ICS standard colors. The map has to
be neat, and well drafted.
2. These should be completed as in-class exercises. Determine the strike and dip of the
units on the following maps (Fig. 2 and Fig. 3), and prepare detailed cross sections
AB and CD on separate sheets of tracing paper. In both cases the CD section should be
perpendicular to the AB section, and should pass through the middle of the map. Be sure
to clearly label your CD section. Determine the thickness of the mudstone in Fig. 2.
Figures from Ragan, D.M., 1985 and Simpson, B., 1968 Fall 2015
Page 2 Geology 3061, Lab 5
Fig. 1
Figures from Ragan, D.M., 1985 and Simpson, B., 1968 Fall 2015
Page 3 Geology 3061, Lab 5
Fig. 2
Figures from Ragan, D.M., 1985 and Simpson, B., 1968 Fall 2015
Page 4 Geology 3061, Lab 5
Fig. 3
Figures from Ragan, D.M., 1985 and Simpson, B., 1968 Fall 2015

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