The marsh zones of Sunderban coast were examined for modern benthic marsh foraminiferal assemblages and correlated with the typical mangrove vegetation. A total of 14 genera of foraminifera and 8 genera of mangrove plants were recorded from the region. The assemblage is characterised by agglutinated and calcareous foraminifera. The high, middle and low marshes are identified on the basis of position of tides. The agglutinated foraminifera Trochammina inflata, Miliammina fusca and Haplophragmoides canarienses with mangroves species of Ceriops tagal, Phoeniz paludosa and Excoecaria agollacha characterize the high marsh zones and the calcareous foraminiferal assemblage comprising Ammonia beccarii, Haynesina germanica, Rosalina bradyi and Elphidium sp. with mangroves including Avicennia spp., Bruiera gymnomorrhiza, Aegialitis roundifolia and Sonneratia apetala indicates low marsh environments.
The Cretaceous chaetetid sponge Acanthochaetetes huauclillensis Sánchez-Beristain and García-Barrera is reported for the first time from the Aptian–Cenomanian Khalsi Formation, Ladakh Himalaya, India. Its low- to high-domical growth form could suggest an adaptation to either an environment with constant sedimentation rates, or to an irregular substrate. However, these growth forms also may indicate an absence of important environmental/sedimentological changes during the lifespan of the sponges. In addition, the growth form of this species suggests a calm, non-turbulent, reef-like microenvironment. Along with the other faunal assemblages, such as the rudists, corals, and the gastropod Nerinea, A. huauclillensis indicates a tropical to subtropical shallow marine carbonate platform setting. This new finding extends its stratigraphic range from the upper Hauterivian to the Aptian–Cenomanian interval in the eastern Tethyan realm.
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