1994-95 - Birbal Sahni Institute of Palaeobotany

1994-95
TrisYlicolpite,f Hl1IulIIujalllii Kar from
(he subsurface Oligocene sediment.;;. neM
Bhavlw£ar. Saurashtra, Guja.mt (x 1000).
samples collected from Palana and Kolyal regions also turned out to be unproductive. However,
bore-hole core samples (drilled hy the MECL and the GSI) near Kuchaur Benia area in
Bikaner District yielded spores and pollen grains. The Lower patt of some of the bore-hole
core (160- 179 m) contai ns different species of Dandotiaspora, Lycopodiumsporites,
Matmiomadhiasil/cites, PlVxapertites, Spinizonoco/pites, Lakiapo/lis, Retitribrevico/porites,
Kielmeyerapollenites, etc. The palynological assemblage indicates a Late Palaeocene age
which was not suspected earlier. All the slides of the productive samples were scanned and
important
taxa marked for photography.
R. K. Kar, Poonam Sharma & Luna
S,P, III Reconstruction of past climatic changes in eastern Himalayan
region using tree-ring data (OST No, ES/44/018/9())
Ohjective To understand past climatic changes especially temperatllre
and precipitation during lastjOO years based olltree-rillg width
pmx\'
data
Tree ring samples collected from the diversifIed forests in the eastern Himalayan
region have been mounted in wooden frames. Surface of these cores were polished through
different grades of sand paper to make tree ring features clearly visihle under binocular
stcreozoom microscope. A large number of cores have been studied to trace out missing or
douhle rings through Cross dating techniques. TIlese studies reveal that among other conileI'S,
Vii., Abies. Tsuga, Taxus haccata and Larix, the endangered taxa growing in this
region have heen found to he most promising for dendroclimatic analysis because of clarity
of their ring boundaries, and good cross dalJng witlun Ihe same lJ'ee and different trees.
However, problem was encountered in ohtaiIII ng replicated samples of these lJ'eesas most
of the old trees were found rolten inside.
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