ABSTRACTS / RESUMES - Comitato Glaciologico Italiano

y mapping the respective moraine ridges. The topograhical
information provided for the larger glaciers is accompanied
by the representation of a seriea of epiglacial forms,
such as snow cornices, wind scoops, snowdrifts and ice
divides.
A particular feature of the Adamello massif is the widespread
cropping out of intrusive magmatic rocks belonging
to the largest pluton of the Alps, now regarded as a bathelith
dating from the Alpine age. Their several lithotypes
(Bianchi & alii, 1970; Callegari & Dal Piaz, 1973) belong
to various more or less differentiated plutons that intruded
from 42 to 30 My B.P. The main outcrops are the Monte
Re di Castello, Western Adamello and Central Presanella
tonalites.
The entire area is heavily imprinted by a glacial and periglacial
morphogenesis associated with slope processs due
to gravity and surface water runoff. Morphochronological
data derived on the basis of the sedimentological characters,
lichen cover, development of soils and of the dating of
buried organic remains (wood, peat, soils) have been used
to distinguish the Upper Pleistocene and Holocene tills
and identify significant Holocene episodes. Radiometrically
dated sites and their ages are also indicated. The wealth
of existing illustrations, photographs and maps has enabled
the evolution of many forms and deposits over the last
100-150 years to be illustrated.
A brief account of the landscape portrayed on this map includes
various types of tills on the edges of the present glaciers
and in the areas they have recently abandoned. These
are intermingled with fluvioglacial deposits and have often
been shaped into accretion and superposition moraine ridges.
The slope dynamics is very active: talus cones, scree,
avalanche tracks and cones, and debris flows have shaped
the flanks of the valleys. Erosion forms often emphasise
the structural features of the area. They are mainly the
work of Pleistocene and Holocene glaciers.
The numerous radiocarbon dates have been used to determine
the features of certain significant morphological evolution:
Neoglacial glacier advancesbetween 3350-3096 and
2706-2207 years B.P. have been identified, and some moraines
attributable to events during the Little Ice Age have
been dated.
RATNESWAR BARMAN
Geomorphological characteristics and socio-economic
pattern in Lower Yulsi Basin, Assam (India)
Department of Geography, Gauhati University,
Guwahati-14, Assam, India
The Kulsi, a tributary to the Brahmaputra river, has carved
out a sub-basin with distinctive fluvio ..geomorphic charac-
teristics within the master basin of the Brahmaputra. The
lower part of the sub-basin in Assam, India over a Precambrian
rock-basement between the Brahmaputra and
Meghalaya Plateau covers an area of 1896 km' and supports
three distinct socioeconomic groups. The differences
in fluvio-geomorphic processes and forms within the basin
have been well-reflected in socioeconomic character of
these social groups. The lowermost floodprone part, for instance,
is dominantly inhabited by the landhungry immigrant
peasants, while the flood-free middle plain and the
foothill region have been under the dominance of indigenous
non-tribal and tribal groups respectively. The pattern
of landuse, settlement and occupation of all the groups are
basically determined by the physical characters like slopes,
channel shifting, bank erosion, floods and waterlogging,
and soil of the respective zones within the Lower Kulsi
Basin.
This study attempts to relate the geomorphic parameters
of different zones of the basin with certain socio-economic
attributes of the population groups. The work is based
partly on primary data and partly on secondary data pertaining
to the basin characteristics.
KAROLY BARTA 1 & TAMAs TARNAI 2
Relation between the size of non-karstic catchment
area and the connecting caves' sizes in a Hungarian
study area
1 Department of Physical Geography, University of Szeged,
Egyetem u. 2., 6722 Szeged, Hungary
2 Department of Mineralogy, Petrology and Geochemistry,
University of Szeged, Egyetem u. 2., 6722 Szeged, Hungary
One of the speleologists' main problems is the determination
of the cave's sizes that they wanted to explore. In our,
research we have tried to apply morphometrical methods
to determine the expectable cave's sizes. The method can
be used in allogenic karst where you can compare the nonkarstic
catchment areas connecting to the different sinkholes.
We can apply itif only these conditions of the different
catchment areas are similar: geological structure; development
of the areas; relief conditions; climate.
If these conditions are similar, then the passages' sizes underlying
the sinkholes depend on mainly the size of the
non-karstic catchment areas because the. similar climate gives
the similar annual rainfall, the similar geological structure
gives the similar sediment types and the catchment
areas' size can determine'the rate of flow and the amount
of the sediment carried by the stream.
Our study area is found in the south part of Hungary, in
the Mecsek Mountains. The extension of the karstic rocks
is about 38 km 2 and this area is connected with an 8 km 2 ,
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