1996-97 - Birbal Sahni Institute of Palaeobotany

1996-97
the total absence of any of the typical Cambrian forms in the Vindhyan, but shows the
presence of Vendian forms only. Thus, it has been concluded that the uppermost limit
of Vindhyan is older than PC/C Boundary.
R. Babu
Visited Jalendri, Narayanpura, Sathur, Dalelpura, Bundi Fort, Utranda,
Khataggarh, Fojai, Kankra, Indergarh Fort and Bhavpura of Vindhyan Supergroup,
Bundi District, Rajasthan for the collection of palynological samples and macroscopic
remains.
Programme 1.2 Palaeobiology of the Proterozoic sediments in Cuddapah,
Kaladgi and Bhima Basins
M. Shukla & M. Sharma
The presence of carbonaceous macrofossil Chuaria has been recorded from 3
ievels in the Owk Shale Formation of Kurnool Group near Ankireddipalli Village in
Ragareddi District of Andhra Pradesh. The carbonised compressions and impressions
of these discoid remains range in size from 0.5 to 5 mm, while majority of the forms
range in size from 2.5 - 3.5 mm. The forms clearly show presence of atleast two type
of vesicles: (i) hollow vesicles with thin walls as is shown by cracking on the margin,
and (ii) thick-walled forms with concentric foldings. Further study is in progress.
Macerated residue of Owk Shale Formation shows rare occurrence of ill-preserved
broken smooth sphaeroidal acritarchs. Well preserved biota mainly consisting of smooth
sphaeroidal acritarchs and broken organic films has also been recorded from the Tadpatri
shales exposed at Bugga Circle near Ankireddipalli Village in Andhra Pradesh.
Programme 1.3 :
Calcareous skeletal algae from Indian Phanerozoic sediments
A.K.
Ghosh
Thin sections of coralline limestones from the Cretaceous-Tertiary sedi ments
of Tiruchirapalli District, Tamil Nadu (Ariyalur, Reddipalayam, Peryarkurchi,
Dalmiapuram, Varagur, Sendurai and Niniyur localities) were studied. The study reveals
that the coralline limestones of Ariyalur, Reddipalayam and Dalmiapuram contain
skeletal algae chiefly belonging to Chlorophyceae and Rhodophyceae. For the first
time, species of Sporolitholl, Halimeda, /Ildopolia, etc. are reported from the Ariyalur
and Reddipalayam localities belonging to Kallankurchi Formation of Maastrichtian
age. Occurrence of skeletal algae from the oil-bearing limestones (as observed in the
field) of Reddipalayam is significant.
B.N. Jana
& A.K. Ghosh
Visited the Cenozoic localities of Kutch District, Mesozoic localities of
Surendranagar District and sea shores of Okha and Dwarka of Gujarat. For the study
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