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Authors
Affiliations
1 Department of Post-Graduate studies and Research in Geology, University of
Mysore, Manasa-Gangotri, Mysore, IN
2 Department of Geology, S. V. University, Tirupati, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 9, No 2 (1968), Pagination: 146-152
Abstract
Foraminiferal samples collected during a recent study of the Upper Cretaceous-Lower Tertiary deposits of Pondicherry area, South India, have yielded a large number of individuals of Tritaxia pyramidata Reuss. A detailed morphological and microwall structural study of these shells has been made. Such a study indicates a high degree of variation in the shell and apertural shapes. Contrary to the data provided by earlier workers, the wall structure in the specimens under examination, has revealed a two layered nature, the inner layer being formed of crystals of calcite. This new investigation demands reassessment of the taxonomic status of the form. Stratigraphically, Tritaxia pyramidata appears to be a high range species, being found distributed almost throughout the above formations.
