Mathematics – Logic
Scientific paper
Aug 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981esrv...17..223h&link_type=abstract
Earth Science Reviews, Volume 17, Issue 3, p. 223-276.
Mathematics
Logic
9
Scientific paper
Barrier islands, beaches, wave-dominated deltas and chenier plains probably form more than one-fifth of present coasts, and constitute an even larger proportion of the subsiding lowland coasts likely to be preserved in the stratigraphic record. The geometry, vertical sequences and composition of their deposits are the result of: (1) shoreline behaviour, whether transgressive, regressive or stable; (2) physical processes, particularly the relative intensities of waves and tides; (3) climate; (4) global tectonic setting; and (5) topography of underlying deposits. Published interpretations indicate that equivalent deposits are abundant in the geological record. Sandstones are mostly quartzose, cemented by carbonates and quartz, and have sheet or linear geometries. Ancient deposits can provide evidence of palaeogeography and some are economically significant, particularly as hydrocarbon reservoir rocks. Four end-member sedimentation models are proposed for the interpretation of ancient deposits: (1) transgressive sheet sands associated with deltas; (2) non-deltaic transgressive sheet sands; (3) regressive sheet sands; and (4) linear sand bodies. Probable depositional settings, geometries, characteristics of deposits and palaeocurrent patterns are discussed.
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