Research-paper
Cretaceous heteromorph ammonoid biostratigraphy of southern India
Ayyasami, K.
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Abstract
Heteromorph ammonoids, distributed variously in the Cretaceous sediments of southern India, are known from the rocks of Late Albian through Middle Maastrichtian. Baculoids are the most frequent, followed by turrilitids, anisoceratids, scaphitids and nostoceratids. A biostratigraphic zonation is proposed based on these ammonoids belonging to 26 species distributed among 13 genera. Stratigraphic correlation with biostratigraphic zones worked out earlier, is attempted. Palaeoecological interpretation based on these uncoiling ammonoids suggests a shallow sea being the general ecological niche. The inner and outer neritic environment is differentiated by the preponderance of anisoceratid fossils in the latter.