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Höör Sandstone

Coal formationsCoal in SwedenEarly Jurassic EuropeGeologic formations of SwedenHettangian Stage
Jurassic SwedenJurassic System of EuropePaleontology in SwedenPliensbachian StageSandstone formationsSinemurian Stage

The Höör Sandstone is a geologic formation in Skåne County, southern Sweden. It is Early Jurassic (Hettangian-Pliensbachian) in age. This unit outcrops in central Skane on a few isolated exposures, being traditionally subdivided into the lower “millstone” (“kvarnstenen”) and the upper “buildingstone”. The lowermost layers where also claimed to host Rhaetian strata, however latter works suggested that the layers devolved as red beds, were part of the new Hörby Formation, thus delimitating the Höör sandstone to the lower Jurassic. It has been assumed to be limited to Hettangian-Sinemurian layers, yet recent palynological analysis suggest the uppermost section is of Pliensbachian age, underlying and maybe interacting with the younger volcanic deposits. The Höör sandstone represents a mostly fluvial unit with a rich collection of fossil plants, yet also includes brackish bivalves in some layers, pointing to marine ingressions locally.

Excerpt from the Wikipedia article Höör Sandstone (License: CC BY-SA 3.0, Authors).

Höör Sandstone
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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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.