The Market Weighton High in the 21st century – new understandings of a long standing problem

2021 ◽  
pp. pygs2021-008
Author(s):  
John K. Wright
Keyword(s):  
21St Century ◽  
Early Cretaceous ◽  
Facies Analysis ◽  
Crustal Stresses ◽  
Marine Facies ◽  
Standing Problem

The sequence of Jurassic and Cretaceous strata laid down in north Lincolnshire is traced northwards onto the Market Weighton High, and compared with the equivalent Cleveland Basin sequence as it is traced south onto the High. Understanding of the manner of operation of the High has long been hindered by the amount of erosion of strata over the High, particularly in the Early Cretaceous. Facies analysis of the remaining strata present on either side of the High is used to estimate the thickness and the facies of strata originally deposited over the High. Although there were periodic uplifts of the High, leading to increasing omissions of strata approaching the High, there is little evidence that during the Jurassic the High was emergent for significant periods. Most strata were either originally present at Market Weighton in marginal marine facies, or continued across the High without interruption. The operation of the High in the light of modern understanding of crustal stresses during the Mesozoic is reviewed.

Tectonic and climatic controls on a Mesozoic forearc basin succession, Alexander Island, Antarctica

2002 ◽  
Vol 139 (3) ◽  
pp. 313-330 ◽  
Author(s):  
GARY J. NICHOLS ◽  
DAVID J. CANTRILL
Keyword(s):  
Facies Analysis ◽  
Fossil Plants ◽  
Forearc Basin ◽  
Gradual Reduction ◽  
Shallow Marine ◽  
Continental Deposits ◽  
Deformation Event ◽  
Marine Facies ◽  
Land Deformation ◽  
The Antarctic

The Cretaceous Fossil Bluff Group on Alexander Island, on the west side of the Antarctic Peninsula, contains a remarkably complete record of the evolution of a forearc basin. The latest (Aptian–Albian) stages in the basin history are recorded in a well-exposed succession at the southern end of the island, where a series of nunataks provide exposure of over a thousand metres of shallow marine and continental deposits. An abrupt facies shift from upper shoreface marine facies to braided fluvial deposits is interpreted as the record of regional uplift in the volcanic arc. This event coincides with the Palmer Land deformation event which may be related to a mid-Cretaceous mantle plume. A gradual reduction in depositional gradient and a return to shallow marine conditions towards the top of the exposed section is interpreted as a consequence of erosion of the arc and subsidence within the basin. Palaeocurrent data and facies distributions indicate that the continental deposits formed a fan-shaped wedge at least 30 km in diameter in the southern part of the forearc basin. Fossil plants indicate that the palaeoclimate was warm and humid throughout the period of deposition. Mapping and facies analysis of the upper part of the Fossil Bluff Group in southern Alexander Island has resulted in a revision of the stratigraphic terminology for the area. The Triton Point Member, formerly part of the Neptune Glacier Formation, has been raised to formation status and two members (the Citadel Bastion Member and the Coal Nunatak Member) and a Bed (the Upper Coal Nunatak Sandstone Bed) are defined here within the formation.

Taxonomy and biostratigraphy of the Late AlbianActinoceramus sulcatuslineage (Early Cretaceous Bivalvia, Inoceramidae)

2009 ◽  
Vol 83 (1) ◽  
pp. 89-109 ◽  
Author(s):  
James S. Crampton ◽  
Andy S. Gale
Keyword(s):  
South Africa ◽  
North America ◽  
Early Cretaceous ◽  
Far East ◽  
Far East Of Russia ◽  
Western North America ◽  
The Far East ◽  
America South ◽  
Marine Facies ◽  
Continuous Range

TheActinoceramus sulcatuslineage (Parkinson, 1819) (Bivalvia: Inoceramidae) is a very distinctive and abundant component of late Albian (Early Cretaceous) molluscan assemblages that is found throughout Europe, Central Asia, Japan and the Far East of Russia, southern and western North America, South Africa, and possibly India, in a range of shallow- to deep-marine facies. The lineage encompasses a wide and continuous range of morphologies that provide evidence of phyletic evolution at varying rates combined with large ecophenotypic plasticity within populations. The evolution ofA. sulcatusmarks the oldest appearance of well-developed radial folds and sulci within the Inoceramidae. The range of morphological variation makes formal taxonomic subdivision of the group problematic. Here we use a combination of formal successional subspecies and informal morphotypes to subdivide the lineage into the following taxa:A. sulcatusformasulcatus, A. sulcatusformasubsulcatus(Wiltshire, 1869),A. sulcatusformamunsoni(Cragin, 1894), andA. sulcatus biometricusCrampton, 1996. Within these taxa and morphotypes, we synonymise a large number of earlier names that have been applied to variants within the lineage. Each of the forms recognized has biostratigraphic utility and we describe four new lineage biozones, in ascending order:A. concentricus parabolicus, A. sulcatus, A. sulcatusformamunsoni, andA. sulcatus biometricusbiozones. The lowest occurrence ofA. sulcatusis approximately coincident with the base of the upper Albian as currently defined, at least throughout most of Europe, and this datum provides a valuable tool in correlation. The nature of radial folds within theA. sulcatuslineage poses interesting but still unanswered questions regarding shell morphogenesis in bivalves and the functional significance (if any) of radial folds in the Inoceramidae.

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