NDLI: Large point bars in a monsoonal estuarine environment (East Coast of India): An atlas of nearsurface sedimentary and biogenic structures

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Large point bars in a monsoonal estuarine environment (East Coast of India): An atlas of nearsurface sedimentary and biogenic structures

Content Provider	Springer Nature Link
Author	Chakrabarti, Amitabha
Copyright Year	2003
Abstract	Tidal point bars located 30–50 km inland from the present-day east coast of India have been extensively studied under varying seasonal conditions. The surface of these bars, when exposed during low tide, is sculptured by various physical sedimentary structures such as linguid ripples, interference ripples of different patterns, asymmetric ripples of cuspate and lunate forms, ladder-back ripples, double-crested ripples and wrinkle marks. The associated biogenic structures are tracks and trails of gastropods, hermit crabs, gobiid fish, birds and various surface designs made by bubbler crabs with their feeding pellets. Study of relief peels from 500 box cores taken from point bars developed in two tidal estuaries of contrasting character shows that horizontal lamination, small ripple lamination, flaser bedding, wavy and lenticular bedding, herringbone cross-stratification, mud/silt couplets, bubble sand in silt, etc. are the common features in these deposits. Flaser bedding and herringbone cross-stratification are more common in this transitional facies than in the open-sea tidal flats of this tropical coast.Similarly, biogenic structures related to the burrowing activity of polychaetes (e.g.Lumbrineris sp.,Nereis sp.) and bubbler crabs (Scopimera sp. andIlyoplax sp.) are the most common features found in the estuarine sediments. Although many features registered in the open-sea tidal flats of the region, such as resting and grazing trails of starfish, ghost crab burrows or agglutinated tubes ofDiapatra sp., are not found in the point bar facies, most of the physical and biogenic structures present in this facies bear a strong resemblance to those found in the open-sea tidal flat environment. This finding advises caution regarding the use of such structures for identifying near-coastal tidal flat environments in the rock record.
Starting Page	95
Ending Page	111
Page Count	17
File Format	PDF
ISSN	0080889X
Journal	Marine Biodiversity
Volume Number	32
Issue Number	1-2
Language	English
Publisher	Springer-Verlag
Publisher Date	2003-01-01
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	Tidal point bar monsoon tidal bedding bubbler crab Biodiversity Freshwater & Marine Ecology Plant Systematics/Taxonomy/Biogeography Animal Systematics/Taxonomy/Biogeography
Content Type	Text
Resource Type	Article
Subject	Aquatic Science Oceanography

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