Gotland is made up of a sequence of sedimentary rocks of a Silurian age, dipping to the south-east.The main Silurian succession of limestones and shales comprises thirteen units spanning 200–500 m (660–1,640 ft) of stratigraphic thickness, being thickest in the south, and overlies a 75–125 m (246–410 ft) thick Ordovician sequence. Precambrian shield rocks that underlie these sediments are found 400 to 500 meters sea level. Sedimentary rocks cropping out in Gotland were deposited in a shallow, hot and salty sea, on the edge of an equatorial continent. The water depth never exceeded 175–200 m (574–656 ft), and shallowed over time as bioherm detritus, and terrestrial sediments, filled the basin. Reef growth started in the Llandovery, when the sea was 50–100 m (160–330 ft) deep, and reefs cont
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| - Géologie de l'île de Gotland (fr)
- Geology of Gotland (en)
- Gotlands geologi (sv)
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| - La géologie de l'île de Gotland présente une séquence sédimentaire d'âge silurien, dont le pendage des couches est au sud-ouest. La succession principale silurienne est constituée d'alternances de marnes et de calcaires, distribuées sur 13 unités de 200 à 500 m d'épaisseur, les séries plus épaisses étant situées au sud. Ces séries recouvrent une série ordovicienne de 125 m d'épaisseur. Les roches sous-jacentes (entre 400 et 500 m sous le niveau de la mer) appartiennent au bouclier d'âge précambrien. (fr)
- Gotland is made up of a sequence of sedimentary rocks of a Silurian age, dipping to the south-east.The main Silurian succession of limestones and shales comprises thirteen units spanning 200–500 m (660–1,640 ft) of stratigraphic thickness, being thickest in the south, and overlies a 75–125 m (246–410 ft) thick Ordovician sequence. Precambrian shield rocks that underlie these sediments are found 400 to 500 meters sea level. Sedimentary rocks cropping out in Gotland were deposited in a shallow, hot and salty sea, on the edge of an equatorial continent. The water depth never exceeded 175–200 m (574–656 ft), and shallowed over time as bioherm detritus, and terrestrial sediments, filled the basin. Reef growth started in the Llandovery, when the sea was 50–100 m (160–330 ft) deep, and reefs cont (en)
- Gotlands geologi utgörs huvudsakligen av en berggrund av kalksten och lerskiffer bildad i ett tropiskt hav för cirka 435 till 420 miljoner år sedan, under perioden silur. Runt kusten har kalkstenar vittrat och eroderats till karakteristiska pelare och isolerade partier kallade raukar. Korallfossil av familjen Rugosa och fossila armfotingar förekommer på många delar av ön. (sv)
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| - Gotland is made up of a sequence of sedimentary rocks of a Silurian age, dipping to the south-east.The main Silurian succession of limestones and shales comprises thirteen units spanning 200–500 m (660–1,640 ft) of stratigraphic thickness, being thickest in the south, and overlies a 75–125 m (246–410 ft) thick Ordovician sequence. Precambrian shield rocks that underlie these sediments are found 400 to 500 meters sea level. Sedimentary rocks cropping out in Gotland were deposited in a shallow, hot and salty sea, on the edge of an equatorial continent. The water depth never exceeded 175–200 m (574–656 ft), and shallowed over time as bioherm detritus, and terrestrial sediments, filled the basin. Reef growth started in the Llandovery, when the sea was 50–100 m (160–330 ft) deep, and reefs continued to dominate the sedimentary record. Some sandstones are present in the youngest rocks towards the south of the island, which represent sand bars deposited very close to the shore line. The lime rocks have been weathered into characteristic karstic rock formations known as rauks. Fossils, mainly of rugose corals and brachiopods, are abundant throughout the island; palæo-sea-stacks are preserved in places. The rocks of Gotland display signals of global extinction events, which take their name from parishes on the island: the Ireviken, Mulde and Lau events. (en)
- La géologie de l'île de Gotland présente une séquence sédimentaire d'âge silurien, dont le pendage des couches est au sud-ouest. La succession principale silurienne est constituée d'alternances de marnes et de calcaires, distribuées sur 13 unités de 200 à 500 m d'épaisseur, les séries plus épaisses étant situées au sud. Ces séries recouvrent une série ordovicienne de 125 m d'épaisseur. Les roches sous-jacentes (entre 400 et 500 m sous le niveau de la mer) appartiennent au bouclier d'âge précambrien. (fr)
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