Late Cretaceous Diurnal Tidal System: A Study From Nimar Sandstone, Bagh Group, Narmada Valley, Central India

Tidalites from the Cenomanian Nimar Sandstone, Bagh Group, Central India, are represented by (i) laterally accreted tidal bundles, (ii) herringbone cross-strata, (iii) sigmoidal cross-strata and (iv) tidal rhythmites with lenticular/wavy bedding. These indicate sedimentation in an upper subtidal to lower intertidal setting within fluvio marine interactive system. Time-series analysis of continuous rhythmic foreset bundles (sub-annual scale) manifests neap-spring tidal cycles within a diurnal tidal system with synodic and sidereal month lengths of similar to 28.4 lunar days and similar to 26.28 solar days respectively. Estimated Earth-Moon system parameters of the Late Cretaceous reveal no significant changes during the last similar to 100 Ma.