Geoscience Reference
In-Depth Information
4. Draw the boundaries of any
subunits and a weathering profile
Where there is differential weathering of
the rock units it can be helpful at this stage
to draw a weathering profile at the side of
the sketch that is directly related to each of
the units. This can be used to relocate your
position on the sketch particularly if there
are many units.
Draw in the boundaries of any subunits
using lines of appropriate weight and
thickness. If appropriate, add other features
such as scree, and further details on
reference points such as vegetation to help
you locate the different parts of the sketch
but ensure that these do not detract from
the main part of the sketch.
4
5. Sketch the detail within each
of the units
Observe each of the units in turn and add
the following: shading for any darker
coloured units (using different densities of
shading as appropriate); any detail within
each of the units/subunits using thin lines,
e.g. thinner beds, sedimentary structures,
folds, etc. Ensure that as you add to the
sketch the boundaries between the main
units remain clearly defined. If for part of
the sketch there are features that are hard
to distinguish, or you do not have time to
add the detail, label the sketch accordingly
(e.g. features not shown, massive).
6. Add the finishing touches
Add a scale, orientation and number/name
the units so that you can refer to each of
them in your further notes. Complete a
detailed sketch of any key parts and mark
how these relate to your main sketch.
Figure 4.5
Continued
The rock face is depicted in the sketch as if it has been projected on to a two-
dimensional vertical plane. (Notebook of Angela L. Coe, The Open University, UK.)
