phenomena. Contrary to this we followed the
legend as used by Dewolf (1972) in which the
loess deposit in situ is indicated in yellow. In
doing so the loess cover can be subdivided
into the loess deposit more or less undisturbed
and the loess cover transported under peri-
glacial conditions. Hereby the Hat surfaces are
shown more clearly. In the accompanying map
the occurrence of terraces, now covered by
loess, can only be indicated by the edges of
the terraces. In the old System the edges of
terraces were indicated according to their
height, now the form of the edges of terraces
is indicated and subdivided to the slope-angle.
As did Dewolf (1972) it is also possible to
give more information in one or more cross-
sections. The profiles are very useful for they
give indications of those phenomena which
cannot be indicated in the map, e.g. to indicate
the dissected tertiary peneplain on the senonian
chalk, covered by loess in the Southern part
of the area. However, since in our sample
area the thickness of the terraces is not known,
no lower boundaries could be drawn. It seems
illogical to indicate on the map that the litho-
logy is only mapped in case the surface deposits
are less than 25 cm, whilst the alluvial and
colluvial deposits are only mapped if their
thickness exceeds 75 cm.
Concluding remarks
In our area which is largely covered by loess,
the older forms cannot be marked on the maps.
Since these older forms contribute largely to
the present day landforms, the maps as publish-
ed are not suitable for this area. By using a
stripe pattern as is done in the maps accord
ing to the methods of the Czechoslovak and
Polish Academies of Sciences, in our 1973
publications, this problem could be solved.
The map made with the unified key does not
give more information than the original maps
according to the methods proposed by the
Czechoslovak and the Polish Academies of
Sciences.
The new French map does give much more
information than all the other Systems used
especially as the morphogenesis is concerned.
The use of cross-sections would improve the
usefulness of all types of geomorphological
maps.
468
REFERENCES
Demek, J. (editor), 1972. Manual of detailed geomorpho
logical mapping. Prague.
Dewolf, Y., 1972. Carte geomorphologique de la France
au 1/50000. Nogent-Le-Roi, Carte et notice explicative.
In Memoires et Documents, Annee 1971, n.s. 12,
pp. 131-150, carte h.t.
H J. van Dorsser Salome, A. I., 1973. Different methods
of detailed geomorphological mapping. InK.N.A.G.
Geogr. Tijdschr., pp. 71-74, with coloured example.
International Geographica] Union. Commission on Applied
Geomorphology. Subcommission on Geomorphological
Mapping, 196S.
The unified key to the detailed geomorphological map
of the world 1 25 000- 1 50 000.
Part I. Problems of the detailed geomorphological map
by M. Klimaszewski.
Part II. Project of the unified key to the detailed geo
morphological map of the world by N. V. Bashenina,
J. Geliert, F. Joly, and others. In Folia Geographica.
Series Geographica-Physica, 2, Krakow.
Tricart, J., 1972, a. Normes pour l'etablissement de la
carte geomorphologique detaillee de la France (1/20 000,
1/25000, 1/50000). In: Memoires et Documents. Annee
1971, n.s. 12, pp. 37-105.
Tricart. J 1972. b. Carte geomorphologique Narbonne 3/4
au 1/25000. In: Memoires et Documents. Annee 1971,
n.s. 12, pp. 107-119. carte h.t.
NOTES
1 A.J. Pannekoek pointed out that we did not comment
on the existing different opinions of the use of signs
to indicate the forms of the Valleys (letter of 6-28-1973).
It is possible to indicate the Valley form in the same
direction as the contour lines (Methods of the Centre
of Applied Geography, Strasbourg, and of the Czecho
slovak Academy of Sciences), or in the opposite direc
tion (Methods of the Polish Academy of Sciences and
of the ITC). To geographers accustomed to use topo-
graphic maps, the first System seems to be the most
appropriate one.
2 J Geliert asked us to try out this method in our
sample area. (Personal letter).
3 The original legend divided the slope categories as
follows 0-2°, 3-5°, 6-15°, 16-35°, 36-55°, and over 55°.
K.N.A.G. Geografisch Tijdschrift VIII (1974) Nr. 5
