--> Upper Jurassic High Resolution Sequence Stratigraphy Across Western Europe, by A. L. Coe, R. Gygi, T. Jacquin, and P-C. de Graciansky; #90986 (1994).

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Abstract: Upper Jurassic High Resolution Sequence Stratigraphy Across Western Europe

Angela L. Coe, Reinhart Gygi, Thierry Jacquin, Pierre-Charles de Graciansky

The Upper Jurassic of Western Europe has been studied within individual sedimentary basins along a NW-SE transect from the Boreal Province in Scotland to the Tethyan margin in Switzerland, and the French Subalpine zones. Correlations from outcrop (and subsurface in the Paris Basin) have been completed using an integration of biostratigraphy, chemostratigraphy, facies analysis and unconformity recognition.

The most numerous and well-dated sections along the transect span the Oxfordian and Kimmeridgian (sensu gallico). The second order cycle peak transgression at the Callovian-Oxfordian boundary is followed by regression which culminated in deposition of coarse siliciclastics in Scotland, shallow-marine carbonates in England, the onset of carbonate platform development in the Paris Basin, more calcareous sedimentation in the Subalps, and development of a carbonate platform and redeposited marls in Switzerland. The onset of transgression in the late Oxfordian is shown by condensed sediments in England, an aggrading carbonate platform in France, and a change in carbonate platform development in Switzerland. A very minor regression or stillstand in the early Kimmeridgian is marked by the in oming of sands in England and non-marine carbonates in Switzerland. Strong transgression in the late Kimmeridgian is marked by organic-rich shales in England, interbedded marls and thin black shales in the French Subalps, and fully marine sedimentation in France and Switzerland. The Upper Jurassic finishes with a long period of regression.

High resolution sequence stratigraphical analysis at the second and third order has allowed correlation of different depositional environments and assessment of the interplay of tectonics, eustacy and sediment supply.

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