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<jats:title>Abstract</jats:title> <jats:p>This appendix provides lists and publication references for all microfossil taxa cited in the memoir. These species, subspecies and varieties are the most important taxa in the definition of biozones and in the biostratigraphic characterization of the defined J sequences.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>This chapter describes Lower Jurassic second-order sequences J00 and J10, and their component third-order sequences J1–J6 and J12–J18. Two sequences (J1 and J3) are new, four sequences (J2, J4, J12 and J16) are amended and one sequence (J17) is renamed.</jats:p> <jats:p>A significant unconformity at the base of the J12 sequence (Upper Sinemurian) is present near the base of the Dunlin Group in the North Viking Graben–East Shetland Platform and in the Danish Central Graben, and correlates with an equivalent unconformity around the margins of the London Platform, onshore UK. A marked unconformity at the base of the J16 sequence is recognized in the North Viking Graben and onshore UK, where it is related to structural movements on the Market Weighton High, eastern England.</jats:p> <jats:p>Several levels of carbon enrichment (carbon isotope excursions (CIEs)) and associated geochemical changes tie to J sequences defining maximum flooding surfaces: the Upper Sinemurian CIE equates to the base J6 maximum flooding surface (MFS), the basal Pliensbachian CIE ties to the base J13 MFS, the basal Toarcian CIE relates to the base J17 MFS and the Toarcian Ocean Anoxic Event corresponds with the base J18 MFS.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>The most important North Sea Jurassic–lowermost Cretaceous lithostratigraphic units, as developed in the UK, Norway and Danish sectors, are summarized in this chapter (55 units from the UK, 25 from Norway and 10 from Denmark). Some significant issues remain with the use and application of lithostratigraphic terminology in the Jurassic of the North Sea Basin. In particular, there are inconsistencies in unit definition and nomenclature changes across country sector boundaries that obscure the recognition of regional stratigraphic patterns that exist across the region. To aid clarity and to overcome some issues of definition, some revisions are made to the existing lithostratigraphic schemes. Several informal lithostratigraphic units are described, a number of unit definitions are revised and various formerly informal units are formalized (Buzzard Sandstone Member, Ettrick Sandstone Member and Galley Sandstone Member). It is recommended that use of the Heno Formation in offshore Denmark is discontinued. In addition, four new lithostratigraphic member terms are introduced (Home Sandstone Member, North Ettrick Sandstone Member, Gyda Sandstone Member and Tambar Sandstone Member). All described units are placed into a sequence stratigraphic context. All significant lithostratigraphic boundaries conform with key sequence stratigraphic surfaces.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>This chapter reviews previously published North Sea Jurassic sequence stratigraphy schemes. Some of these works have applied the originally published J sequence schemes, while 18 have established new schemes. The most significant of these are discussed and compared to the newly defined J sequences. Most of these additional documented schemes have been defined for the Upper Jurassic interval, with a more limited number of schemes for the Lower and Middle Jurassic. Different authors have adopted a wide range of sequence notation methods while none of the publications describing the new sequence schemes has offered detailed sequence definitions. Due to the ensuing confusion, it is recommended that a more formal method of sequence definition is adopted in future sequence stratigraphic studies. In intervals in which reservoir successions are developed, such as the Fulmar Sandstone Member in the J56–J63 sequences, particularly in fields in which extensive coring has taken place, authors have usually been able to recognize additional sequences, which are probably at fourth-order scale, at a higher resolution than the defined third-order J sequences.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>This chapter describes Middle Jurassic second-order sequences J20 and J30, and their component third-order sequences, J22–J26 and J32–J36.</jats:p> <jats:p>The J22 sequence contains the major Intra-Aalenian Unconformity (‘Mid-Cimmerian’) across a wide area of the North Sea Basin and an equivalent event onshore UK. The base J24 (Lower Bajocian) is marked by the Rannoch Shale (Brent Group) and by the flooding of the Ollach Sandstone, Hebrides Basin. The base J26 (Upper Bajocian) ties to the Mid Ness Shale (Brent Group) and the base of the Upper Trigonia Grit Member, central England.</jats:p> <jats:p>The base J32 (Upper Bajocian) ties to the base of the Tarbert Formation, the base of the Great Oolite Group in central England and the base of the Great Estuarine Group, Hebrides Basin. The base J33 (Middle Bathonian) falls within the Tarbert Formation and the base of the Taynton Limestone, central England. The base J34 (uppermost Middle Bathonian) commonly falls at the top of the Brent Group. The base J36 (uppermost Bathonian) represents a major increase in marine influence, at the base of the Beatrice Formation, in the Inner Moray Firth and at the base of the Staffin Bay Formation, Hebrides Basin.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>Many of the stratigraphic sequences recognized in North Sea Jurassic well sections correspond to mappable surfaces on seismic sections. Typically, however, sequences are only mappable seismically within individual sub-basins, and seismic correlation between sub-basins, or across highs, is generally impossible without independent control from wells. Particularly prominent seismic sequence boundaries occur at near-base J54 in the Inner Moray Firth (‘Intra-Oxfordian Event’) the Viking Graben (‘Top Heather’ in this area), base J62 (‘Top Heather’, Moray Firth), base J66 (‘Top Lower Hot Shale’, Inner and Outer Moray Firth), base J71 (East Shetland Platform), base J73 (‘Top Siltstone Member’, Moray Firth) and top J70/base K10 (‘Base Cretaceous Unconformity’ (BCU), basin-wide). The BCU is the most frequently mapped seismic horizon in the North Sea Basin in Jurassic–basal Cretaceous studies. This surface, at the base of the Cromer Knoll Group, separates synrift sediments from post-rift successions above and marks a major shift in the tectonic evolution of the North Sea Basin.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>Of 40 recognized Jurassic–earliest Cretaceous sequence boundaries or surfaces, 21 are considered to have had a primary tectonic control on their generation, particularly during the Bathonian–Berriasian interval of synrift-dominated tectonism. These boundaries include the intra-J22 sequence boundary, the base J36, the base J54, the base J55, the intra-J56 transgressive surface, the base J62, the base J63, the base J64, the base J71, the base J73 and the top J76 (‘Base Cretaceous’). In the study area, these events all occurred within a marine setting and none can be unequivocally matched to times of subaerial exposure or coastal onlap. Ten Jurassic sequence surfaces appear to have had a primary eustatic control on their generation, some of which are also associated with the deposition of major marine source-rock facies, including the base J18 and the base J74.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>This chapter describes the methodology employed to recognize depositional sequences in well data, involving the integration of wireline logs, biostratigraphy, lithostratigraphy (and lithological interpretations), seismic and sedimentology (particularly facies analysis), with an emphasis on a pragmatic approach to sequence recognition in North Sea Jurassic–lowermost Cretaceous well successions. Wireline log profiles characterizing individual depositional sequences or parts of sequences are illustrated by reference to key North Sea well sections.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>The application of sequence stratigraphic concepts and methods significantly enhances the evaluation of stratigraphic traps. In this chapter, five examples of, as yet undrilled, potential UK North Sea Jurassic combination stratigraphic traps, from the East Shetland Platform, South Viking Graben, Inner Moray Firth and Central Graben, are discussed and the potential application of sequence stratigraphic methods in their evaluation considered.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>An updated sequence stratigraphic framework, comprising 39 third-order stratigraphic sequences, for the Jurassic–lowermost Cretaceous of the North Sea, is described by reference to key wells and seismic lines across the UK, Norway and Denmark sectors, and, where possible, to onshore UK outcrops. It appears evident that regional tectonics provided the main control on sequence development, particularly during the Late Jurassic. There is a close relationship between key sequence stratigraphic surfaces and many lithostratigraphic formation and member boundaries throughout the North Sea Jurassic. Four new sandstone members are defined. A biozonation scheme for the study interval is described that provides essential characterization of the defined sequences.</jats:p>