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Djupadal Formation

Coal formationsCoal in SwedenEarly Jurassic EuropeGeologic formations of SwedenJurassic Sweden
Jurassic System of EuropePaleontology in SwedenPliensbachian StageSandstone formationsToarcian Stage
Korsarödssjön 2010
Korsarödssjön 2010

The Djupadal Formation is a geologic formation in Skåne County, southern Sweden. It is Early Jurassic (probably Pliensbachian-Toarcian, or Late Toarcian) in age. It is part of the Central Skåne Volcanic Province, know by the discovery of basalt tuff layers, including Sandåkra, Korsaröd and Djupadal. An original analysis of the location of Korsaröd led to a Toarcian-Aalenian age, but was dismissed in 2016, when a series of Palynogical samples recovered a Late Pliensbachian and probably Lower Toarcian age for the Korsaröd Outcrop. The same year this result was also challenged by an in-depth study of the Lilla Hagstad neck that yield a Late Toarcian Age. The formation was deposited in the Central Skane region, linked to the late early Jurassic volcanism. The Korsaröd member includes a volcanic-derived Lagerstatten with exceptional fern finds. The data provided by fossilized wood rings showed that the location of Korsaröd hosted a middle-latitude Mediterranean-type biome in the late Early Jurassic, with low rainfall ratio, delayed to seasonal events. Superimposed on this climate were the effects of a local active Strombolian Volcanism and hydrothermal activity.

Excerpt from the Wikipedia article Djupadal Formation (License: CC BY-SA 3.0, Authors, Images).

Djupadal Formation
M 1975, Höörs kommun

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N 55.98 ° E 13.63 °
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Tjörnarps Sjöpark

M 1975
243 71 Höörs kommun
Sweden
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Korsarödssjön 2010
Korsarödssjön 2010
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Central Skåne Volcanic Province

The Central Skåne Volcanic Province was a site of volcanic activity in the Scania region of Sweden during the Mesozoic Era of the Earth's geological history. The volcanism began with a first and main phase in late Sinemurian to Toarcian times around 191 to 178 Ma. Then volcanism continued sporadically for another 80 million years. More than one hundred volcanic necks of basaltic composition exist in Scania evidencing this volcanism. In central Scania, volcanism was in the form of a volcanic field of cinder cones that had Strombolian eruption styles. These cones produced tuffite deposits made largely of lapilli with rare volcanic bombs. Pyroclastic materials were subsequently palagonitized or largely altered to clay minerals. While eruptions occurred on land the sea was likely very close to the area. Besides purely pyroclastic sediments, lahar deposits have also been identified around the remnants of the volcanoes.Beneath a lahar deposit at Korsaröd (Djupadal Formation), Early Jurassic plant fossils including wood, pollen and spores have been exceptionally well preserved. The degree of preservation is such that cell-scale features like organelles and chromosomes have been identified in the fossils. At this location plants grew in a substrate with extensive hydrothermal alteration.The volcanism is possibly the result of decompression melting of the lithospheric mantle beneath. The volcanism is linked to a rift flank fault along the Sorgenfrei–Tornquist Zone, which is a failed rift associated with extension in the North Sea and the opening of the North Atlantic. The background to the volcanism is the break-up of Pangea, and thus it is analogous to the much more voluminous Karoo-Ferrar flood basalts of Southern Africa.