This article was accepted into the corpus but its outbound wikilinks were never NER-processed — typical at the deepest BFS hop or when the run's entity cap was reached. No expansion funnel to show.
| Upper Greensand | |
|---|---|
| Name | Upper Greensand |
| Type | Geological formation |
| Period | Cretaceous |
| Primary lithology | Sandstone, glauconitic sandstone |
| Otherlithology | Siltstone, chert, phosphatic nodules |
| Namedfor | Greensand |
| Region | Southern England, Isle of Wight, Dorset, Hampshire, Wiltshire, Devon, Somerset |
| Country | United Kingdom |
Upper Greensand is a Cretaceous siliciclastic unit known for its glauconitic sandstones, silts, and nodular cherts that commonly overlie chalk successions across southern England. It forms an important marker bed within regional stratigraphy and has yielded diverse fossils, influencing studies by geologists and paleontologists from institutions such as the British Geological Survey, Natural History Museum, London, and universities including University of Oxford and University of Cambridge. The unit has been mapped and quarried in areas administered by local authorities like Dorset County Council and conservation bodies such as National Trust and English Heritage.
The lithology comprises glauconitic sandstones, sandy siltstones, phosphatic horizons and chert nodules described in fieldwork by staff from the British Museum (Natural History), researchers at the Geological Society of London, and surveyors associated with the Ordnance Survey. Typical facies display bioturbation and glauconite-rich grains comparable to other Cretaceous siliciclastics recorded at sites investigated by teams from Imperial College London and the University of Southampton. Petrographic and geochemical analyses published by groups at the University of Bristol and University of Leeds show variations in grain size, heavy mineral assemblages, and authigenic phosphate content analogous to descriptions in monographs by the Geological Survey of Great Britain.
Stratigraphically, the unit occupies a horizon between the Chalk Group and subjacent Lower Cretaceous marls, correlated to stages studied at the Natural History Museum, Paris and chronostratigraphic schemes endorsed by the International Commission on Stratigraphy. Biostratigraphic frameworks using ammonite zonation established by researchers at University College London and radiometric constraints refined by teams at Royal Holloway, University of London place deposition in the Cenomanian–Turonian interval, contemporaneous with sequences examined in the Paris Basin and compared with basins like the Ligurian Basin and the Hercynian Basin in Europe. Correlations with units described in the Weald Basin and published by scholars from the University of Southampton support regional chronostratigraphic models used by committees of the British Association for the Advancement of Science.
Exposures occur on the Isle of Wight, along the Jurassic Coast, across Dorset, Hampshire, Somerset, Devon, and parts of Wiltshire where mapping by the British Geological Survey and academic field parties from University of Plymouth document lateral facies changes. Coastal cliff sections near Portland Bill and inland quarries such as those in the New Forest and around Salisbury Plain exhibit variations in thickness and composition noted in geological maps produced by the British Geological Survey and regional studies by the Royal Society. Comparative work with Mediterranean localities by researchers at the University of Barcelona and the University of Bologna highlights differences in provenance and depositional dynamics.
The unit has produced marine invertebrates—including ammonites and bivalves—catalogued in collections at the Natural History Museum, London and the Sedgwick Museum of Earth Sciences with specimens referenced in monographs by curators from the Smithsonian Institution and the Muséum national d'Histoire naturelle. Vertebrate remains such as ichthyosaurian and dinosaurian fragments have been reported in field reports by teams from University of Portsmouth and the University of Oxford and compared to taxa described from the Wealden Group and the Purbeck Group. Microfossil assemblages used for biostratigraphy have been analyzed by micropaleontologists affiliated with University College London and the Natural History Museum, Paris, facilitating correlations with faunas from the English Channel and the North Sea Basin.
Quarrying of glauconitic sandstones and chert for building stone and aggregate has historical precedence in towns administered by Dorset County Council and supplied to projects involving firms registered with the Chartered Institute of Building. The unit’s phosphatic horizons attracted phosphate extraction interests documented in reports by the Department of Trade and Industry and industrial surveys involving the Institute of Materials, Minerals and Mining. Environmental assessments by planners in Hampshire County Council and conservation agencies such as Natural England evaluate impacts on coastal cliffs like those managed by the National Trust. Studies by researchers at the University of Exeter and University of Plymouth address erosion processes affecting sites along the Jurassic Coast World Heritage Site.
Early descriptions appear in works by 19th-century geologists who contributed to publications of the Geological Society of London and maps by the Ordnance Survey, with nomenclature refined in surveys issued by the British Geological Survey. Contributions from figures associated with the Royal Society and academic departments at the University of Cambridge and University of Oxford advanced lithostratigraphic and paleontological understanding. International comparisons involving scientists from institutions like the University of Göttingen and the Muséum national d'Histoire naturelle influenced adoption of stratigraphic conventions applied to the unit in British stratigraphic lexicons endorsed by the International Union of Geological Sciences.
Conservation designations overseen by bodies such as Natural England, English Heritage, and the National Trust protect notable exposures and fossil localities against development pressures regulated by councils including Dorset County Council and Hampshire County Council. Planning decisions by local authorities and appeals heard with representation from organizations like the Royal Town Planning Institute weigh aggregate extraction against preservation of geoparks and World Heritage Sites like the Jurassic Coast. Academic initiatives from universities such as University of Southampton and University of Portsmouth collaborate with museums including the Natural History Museum, London to document and curate specimens while engaging public outreach through partners like the National Trust and English Heritage.
Category:Geology of England Category:Cretaceous geology