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The Sub-Paleogene surface is an ancient erosion surface that exists in southern England. In parts the Sub-Paleogene surface appear as tilted plain and parts as an unconformity beneath sediments of
Paleogene The Paleogene ( ; British English, also spelled Palaeogene or Palæogene; informally Lower Tertiary or Early Tertiary) is a geologic period, geologic period and system that spans 43 million years from the end of the Cretaceous Period million yea ...
age. The surface was formed by the erosion of chalklands in England following a
regression Regression or regressions may refer to: Science * Marine regression, coastal advance due to falling sea level, the opposite of marine transgression * Regression (medicine), a characteristic of diseases to express lighter symptoms or less extent ( ...
in the
Maastrichtian The Maastrichtian () is, in the ICS geologic timescale, the latest age (uppermost stage) of the Late Cretaceous Epoch or Upper Cretaceous Series, the Cretaceous Period or System, and of the Mesozoic Era or Erathem. It spanned the interval from ...
age. The time during which the surface formed has been estimated by comparing the age of the last Maastrichtian chalk to deposit and the age of the earliest Paleogene sediment to cover the surface. This yields a bracket between 71–73 million years ago (Mya) and 59.3 Mya. The cause of the regression and hence of the erosion above sea level has been debated. It has been linked to
eustatic Mean sea level (MSL, often shortened to sea level) is an average surface level of one or more among Earth's coastal bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical datuma standardised g ...
sea level change, the Alpine orogeny and —more recently— to the Iceland plume. The surface was formerly known as Sub-Eocene surface until it was discovered that some sediments overlying the surface were in fact Paleogene.


See also

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Cretaceous–Paleogene boundary The Cretaceous–Paleogene (K–Pg) boundary, formerly known as the Cretaceous–Tertiary (K–T) boundary, is a geological signature, usually a thin band of rock containing much more iridium than other bands. The K–Pg boundary marks the end of ...
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Sub-Mesozoic hilly peneplains 200px, An undulating hilly landscape in Halland.html"_;"title="Falkenberg_Municipality,_Halland">Falkenberg_Municipality,_Halland. file:Dagsås_-_KMB_-_16000700002822.jpg.html" ;"title="Halland..html" ;"title="Halland.html" ;"title="Falkenberg Mu ...
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Utsira High Utsira High no, Utsirahøgda is a basement high and horst (geology), horst in the southwest of the Norwegian continental shelf. It lies east of the Viking Graben and west of the Stord Basin, Stord and Egersund Basin, Egersund sedimentary basin, b ...


References

{{geology-stub Cretaceous England Unconformities Erosion landforms Paleogene England