eng Ansari Education and Research Society Journal of Ultra Scientist of Physical Sciences December 2010 22 3 573 584 juc 931 article Mu. Ramkumar (muramkumar@yahoo.co.in) 1 K. Anbarasu 1 T. Sugantha 2 Jyotsana Rai 2 G. Sathish 2 R. Suresh 2 Department of Geology, Periyar University, Salem - 636011 (INDIA) Birbal Shni Institute of Palaeobotany, University Road, Lucknow - 226007 (INDIA) <p style="text-align: justify;">Occurrences of exposures of Late Maastrichtian-Early Danian rocks are found near Sendurai and Niniyur villages along E-W trending ephemeral streams. These exposures contain multiple levels of three types of uniform sized, spherical moulds/casts of presumably unhatched egg precursors of sauropods. Based on the morphological and size characteristics, these moulds/casts are assigned to megaoolithid oogenus provisionally. Each cluster has 7 or 8 moulds aligned circularly. The matrix surrounding these clusters contains typical nanofossil assemblage representative of Latest Maastrichtian. Sediments overlying these clusters, interpreted to be dinosaur nesting sites contain clayey admixture and silty clay/shale deposits that are reported to be weathered products of Deccan volcanic ash. These deposits are followed by bivalve-rich limestones, bioclastic nautilus limestones and calcareous sandstones that are typical of Danian deposits of Anandavadi member of the Niniyur Formation. Preliminary field observations suggest that faunal extinction preceded the Cretaceous-Tertiary boundary (KTB) mass extinction. Further studies are needed to ascertain the paleoenvironmental conditions that contributed to the demise of the dinosaurs. There is an urgent need to preserve this important dinosaur nesting site for geotourism and future studies to understand the geological past.</p> https://ultraphysicalsciences.org/paper/931/ exposures Dinosaur nesting site Near sendurai,