Geoscience Reference
In-Depth Information
recordings should be plotted precisely on a topographic fi eld
map or aerial photograph (Chapter 10). Occasionally the hard-
copy accurate base map is not at a large enough scale and, in
these cases, it may be useful to draw an expanded map in your
notebook and to add other topographical features (Figure 4.10).
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Figure 4.10
Example of an enlarged, to scale and orientated detailed map produced in the fi eld at a higher
resolution than the fi eld map to show the details of several thin beds. Note that the main topographical features
have been included along with the orientation and scale. (Notebook of Kate Bradshaw, The Open University, UK.)
Figure 4.9
Examples of different types of sketch map constructed to show the position of important geological
information. (a) River section in Argentina to show the location of a series of graphic logs. Note the GPS
readings for key topographical features (a, b, c, etc.) and cross references to notebook pages where the graphic
logging notes are located. The map would have been better with a north directional arrow rather than the E and
W because these make it look like a cross-section. (b) Simplifi ed map of a disused quarry, Oxford, UK showing
the location of the two different sections that were measured (1 and 2). (c) Sketch map of Choirokoitia gorge,
Cyprus showing the main topographical features and the relative position of further notes (A to F). (d) Detailed
sketch map of about 400 x 400 m of the fl oor of a kimberlite mine, South Africa showing the relationship
between the different rock types. Colour and abbreviations for the rock classifi cation have been used very
effectively to distinguish these complex relationships. (a to c: Notebook of Angela L. Coe, The Open University,
UK; (d) Notebook of Richard Brown, The Open University, UK.)
