Author:
Chakravorti Sanjukta,Prasad Sengupta Dhurjati
Abstract
A new, partially preserved skull of chigutisaurid amphibian (temnospondyli) has been reported for the first time from the Late Triassic Tiki Formation of India. Chigutisaurids are now known to occur in Australia’s Early and Late Triassic, the Late Triassic in India, Argentina, and Brazil, the Jurassic of South Africa and Australia, and the Cretaceous of Australia. In India, the first appearance of chigutisaurids marks the Carnian—middle Carnian/Norian Boundary. This work also attempts to correlate, again for the first time, the advent of chigutisaurids and the occurrence of Carnian Pluvial Episodes (CPE) in the Late Triassic Maleri and Tiki Formation of Central India. The new specimen belongs to the genus Compsocerops prevalent in the Late Triassic Maleri Formation occurring 700 km south. However, the chigutisaurid specimen recovered from the Tiki Formation is a new species when compared to that of the Maleri Formation. It has the presence of an inward curved process of the quadratojugal as opposed to the straight downward trending process of the quadratojugal, the presence of vomerine foramen, shorter and wider interpterygoid vacuities, wider subtemporal vacuities, and the base of the interpterygoid vacuities at the same level with the base of the subtemporal vacuity. It proves that the Tiki Formation is coeval with the Lower Maleri Formation and a part of Upper Maleri.
Funder
Indian Statistical Institute, Kolkata
Institute of National Importance under the Ministry of Statistics and Programme Implementation (MoSPI), Government of India
Subject
General Agricultural and Biological Sciences,General Biochemistry, Genetics and Molecular Biology,General Medicine,General Neuroscience
Reference89 articles.
1. A note on the Maleri beds of Hyderabad State (Deccan) and the Tiki beds of south Rewa;Aiyengar;Records of the Geological Survey of India,1937
2. The Carnian pluvial event in Western Europe: new data from Iberia and correlation with the Western Neotethys and eastern North America–NW Africa regions;Arche;Earth-Science Reviews,2014
3. Gondwana vertebrate faunas of India: their diversity and intercontinental relationships;Bandyopadhyay;Episodes Journal of International Geoscience,2020
4. The Carnian Pluvial Episode and the origin of dinosaurs;Benton;Journal of the Geological Society,2018