As both represent
aspects of their environment, sediment and organisms can be closely
related. In deltaic systems, numerous studies have examined the range of
delta types and subenvironments and characterized facies and icnology. Yet,
these relations are less well characterized in outer shelf deltas, a niche
that Dasgupta and co-authors fill. This paper characterizes and ranks
ecologic stress factors on the interactions between animals and substrates in a
shelf-edge delta environment of the Plio-Pleistocene Gelasian Mayaro Formation
of Trinidad Island, Trinidad. The field observations of the equatorial
paleo-Orinoco system reveal a diverse suite of sedimentologic and ichnologic
attributes, interpreted to reflect an extremely variable and dynamic marine
environment. These data lead to an exposition of a comprehensive
ichno-sedimentological conceptual model for large-river, low-latitude,
accommodation-driven, shelf-edge deltas.
Living on the edge: evaluating the impact of
stress factors on animal-sediment interactions within subenvironments of a
shelf-margin delta, the Mayaro Formation, Trinidad Sudipta Dasgupta, Luis A. Buatois, and
M. Gabriela Mángano
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