--> Outcrop Sequence Stratigraphy of Carbonate Ramp Deposits: The Case of the Upper Cretaceous Series on the Castilian Ramp (Northern Spain), by M. F. D. Floquet; #90986 (1994).

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Abstract: Outcrop Sequence Stratigraphy of Carbonate Ramp Deposits: The Case of the Upper Cretaceous Series on the Castilian Ramp (Northern Spain)

Marc F. D. Floquet

The carbonate-dominated sedimentary series deposited on the Castilian Ramp (Northern Spain), from the Vraconian to the upper Maastrichtian, displays a great diversity of facies, broken up by a lot of biosedimentary discontinuities, recording many palaeoenvironmental changes and allowing establishment of an accurate outcrop sequence stratigraphy. These series are considered to represent a very long term transgressive-regressive depositional megacycle. This Late Cretaceous Megacycle is subdivided into four long term transgressive-regressive depositional cycles, ranging respectively: 1) from the Vraconian to the middle Cenomanian, 2) from the late Cenomanian to the earliest Coniacian, 3) from the early/middle Coniacian to the late Santonian and 4) from the latest Santonian to the late Ma strichtian. Several well characterized short-term transgressive-regressive depositional cycles compose each of these long-term cycles. Most of the recognised cycles correlate perfectly with those defined from the series of the distally steepened part of the ramp and from the outer and deep series of the Basque basin. The origin and development of the megacycle as well as of the long and short-term cycles resulted mainly from the tectonic behavior of the Basco-Cantabrian passive margin and thus were strongly controlled by the evolution of the Bay of Biscay linked to the relative movements of the Iberian and European plates.

AAPG Search and Discovery Article #90986©1994 AAPG Annual Convention, Denver, Colorado, June 12-15, 1994