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标题：Interconnected chambered trace fossils, Pliocene lower Tipam Formation, Tripura, India - 261–270
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作者：Hemanta S.RAJKUMAR ; Vladimir ŠIMO
期刊名称：Annales Societatis Geologorum Poloniae
印刷版ISSN：0208-9068
出版年度：2020
卷号：90
期号：3
页码：261-270
DOI：10.14241/asgp.2020.20
语种：English
出版社：Panstowowe Wydawnictwo Naukowe
摘要：A new kind of trace fossil characterized by filled ellipsoidal chambers interconnected by a boxwork of burrows, shafts and tunnels, in different horizontal planes, is observed in the medium-grained fluvial sandstone of the Pliocene Lower Tipam Formation in the Amarpur area of Tripura in northeast India. The chambers have variable dimensions with lengths of 3–16 cm, widths of 3–10 cm and heights of 2–6 cm. Diameters of the connecting tunnels and shafts are 0.8–0.9 cm on average. The traces are considered to be nest systems of social insects. The discovery is noteworthy as far as the geology of Tripura state is concerned, as such chambered traces have not previously been reported from the Indian sub-continent. Morphology of the studied specimens point toward a new ichnospecies, Vondrichnus amarpurensis isp. nov. of the ichnofamily Krausichnidae.
关键词：Chambers;termite nest;boxwork;burrows;fluvial sandstone;Pliocene.