3. Map according to the method of the Polish
Academy of Sciences (Klimaszewski). The same
difficulties, encountered in the previous method,
occured. In this legend also, no criteria for the
thickness of the loess cover are mentioned.
Two maps were, therefore, produced according
to this legend. Contrary to the map according
to the method of Demek, the dissected pene-
plain can be indicated on the first map. The
presence of the terrace is suggested due to the
indication of the edges of river terraces. In the
adapted Version, however, the river terrace was
made clearer by using the stripe pattern. Dif-
ferent tones of one colour are used for indicating
classes of slope which are defined exactlyas
are the edges of river terraces. No symbol for
swamp is available.
4. Map according to the ITC System of geo-
morphological survey (Verstappen and Van
Zuidam). This system, based on geomorpho-
logical units, indicates the lithology in the same
grey tone as the one used for the base map.
If the colours used for the units are not printed
too heavily, the map gives a good impression
of the geomorphology. Black Symbols indicate
the minor forms. The small lines parallel to
the terrace edge in the symbol 'edge of terrace'
(T) prove to be impractical. In the geomorpho-
logical map accompanying the ITC textbook
this parallel line has been omitted, as are the
symbols indicating the height of the terrace
edges. Therefore, in the map given with this
publication, no indication of the height has
been given.
5. Map according to the method of the Centre
of Applied Geography, Strasbourg (Tricart).
Since Tricart indicates that in areas with a loess
cover of more than 1 meter in thickness the
lithology of the substratum should not be
mapped, the terrace as a geomorphological
unit disappears. The edge of the terrace, how
ever, gives an indication of its existence. In this
legend an indication of the exact height of the
edges of terraces is given by different symbols.
The minor landforms and their ages are precisely
mapped by coloured symbols. The use of
colours for the lithology as well as for the
chronology is confusing.
In the different maps colours are used for:
the process in the method by Annaheim and
Moser;
the chronology and the morphological units
in the method by the Czechoslovak Aca
demy of Sciences;
the chronology with the use of different tones
for indicating classes of slope by the
method of the Polish Academy of Sciences;
the geomorphological units in the ITC system;
the chronology and lithology in the method
of the Centre of Applied Geography,
Strasbourg.
The chronology is indicated by:
symbol in the method of Annaheim and
Moser;
colour by the Czechoslovak, Polish and
French methods;
letter symbols by the Czechoslovak method
and the ITC system.
The possibilities of indicating special details in
the maps are:
the forms of the Valleys only in the ITC system
and the French method;
the edges of terraces are indicated in all the
maps except the one according to the
Czechoslovak methoda differentiation of
height of the edges is also possible in the
Polish, ITC and French Systems.
Loess is treated as a deposit in all Systems
except for the Czechoslovak system in which
it is part of several units.
Indication of the loess in the other maps is
different:
for Annaheim and Moser as a symbol under
the head accumulation forms;
on the Polish map as an aeolian deposit in
the colour according to the chronology,
printed over the other symbols used;
in the ITC system as part of the lithology
printed in grey under the geomorphological
units;
in the French method under the head 'forms
due to accumulation and type of deposits',
with a symbol in the colour of the chrono
logy.
Solifluction phenomena are sometimes indicated
by separate symbol:
in the system of Annaheim and Moser by a
symbol in the colour used for accumulation
forms;
73
CONCLUDING REMARKS
K.N.A.G. Geografisch Tijdschrift VII (1973) Nr. I
