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Encyclopedia > Yoldia Sea

Yoldia sea is a name given by geologists to a variable brackish-water stage in the Baltic sea basin that prevailed after draining of Baltic ice lake had reduced the lake level to then sea level. Dates for the Yoldia sea are obtained mainly by radiocarbon dating material from ancient sediments and shore lines. They tend to vary by up to a thousand years, but a good estimate is 10,300 – 9500 BP. The sea came to an end when isostatic rise of Scandinavia closed or nearly closed its effluents, altering the balance between saline and fresh water. Yoldia sea became Ancylus lake. The Baltic Sea is located in Northern Europe, from 53 deg. ... For other uses, see Scandinavia (disambiguation). ... Ancylus lake is a name given by geologists to the body of fresh water that replaced the Yoldia sea after the latter had been severed from its saline intake across central Sweden by the isostatic rise of south Scandinavian landforms. ...


The name of the sea is taken from the bivalve, Portlandia or Yoldia arctica, found around Stockholm. This bivalve requires cold saline water. It characterizes the initial phase of the Yoldia Sea, during which saline water poured into the Baltic, before the acceleration of glacial melting. The Old town in Stockholm from the air (help· info) is the capital of Sweden, located on the east coast at the entrance of lake Mälaren. ...


Description

The Baltic ice lake came to an end when it overflowed through central Sweden and drained, a process complete by about 10,300 BP. The straits through the present Stockholm region were the only outlet at that time. When lake level reached sea level the difference in salinity caused a backflow from the North Sea, creating saline regions in which Yoldia flourished. This phase lasted until about 10,000 BP. The North Sea is a sea of the Atlantic Ocean, located between the coasts of Norway and Denmark in the east, the coast of the British Isles in the west, and the German, Dutch, Belgian and French coasts in the south. ...


Subsequently increased melting of the glacier provided additional fresh water and the lake became stratified, with salt water on the bottom and fresh on top. Over the life of the sea and from location to location the salinity was a variable. Whether it is possible to speak of stages of salinity that would apply uniformly to the whole sea is debatable.


Also at about 10,000 BP, the lake/sea broke through Denmark creating the first Great Belt. It was less than 1 km wide and included two channels at the northern end. It was blocked again by rising land that created Ancylus lake. The straits of Denmark. ...


Geographically, the Gulf of Bothnia remained under the ice. The Gulf of Finland was open but most of Finland was an archipelago, over which debris carried by glacial streams gradually spread. A land bridge joined Germany to southern Sweden through Denmark. Relieved of its weight of ice, Finland rose gradually and unevenly from the sea. Parts of the Yoldia shoreline are above sea level today while other parts remain below. The Yoldia Sea toward its end was about 30m below current sea level. A channel at the location of the Neva river connected Yoldia sea to Lake Ladoga. The Baltic Sea The Gulf of Bothnia (Fin. ... The Baltic Sea The Gulf of Finland is an arm of the Baltic Sea that extends between Finland (to the north) and Estonia (to the south) all the way to the city of Saint Petersburg in Russia, where the river Neva drains into it. ... An archipelago is a landform which consists of a chain or cluster of islands. ... The River Neva (Нева́) is a 74 km long Russian river flowing from Lake Ladoga (Ладожское Озеро — Ladozhskoye Ozero) through the Karelian Isthmus (Карельский Перешеек — Karelskii Peresheyek) and the city of Saint Petersburg (Санкт — Петербург — Sankt Peterburg) to the Gulf of Finland (Финский Залив — Finskii Zaliv). ... Map of lake Ladoga Towpath Bridge between Lake Ladoga and Lake Onega (from a photograph taken ca. ...


Yoldia sea existed entirely within the Boreal Blytt-Sernander period. The forests and species lining its shores were Boreal. Mesolithic cultures continued to occupy Denmark/south Sweden and the southern shores of the sea. The sea as an ecologic system came to an end when Scandinavia rose sufficiently to block the flow through the Stockholm area and the saline balance shifted toward a lacustrine ecology once again. The Boreal in paleoclimatology was the first Blytt-Sernander period, pollen zone and chronozone of Holocene north Europe. ... The Blytt-Sernander classification, or sequence, is a series of north European climatic periods or phases based on the study of Danish peat bogs by Axel Blytt (1876) and Rutger Sernander (1908). ... The Mesolithic (Greek mesos=middle and lithos=stone or the Middle Stone Age) is the period between the Paleolithic and Neolithic periods. ... For other uses, see Scandinavia (disambiguation). ...


  Results from FactBites:
 
Yoldia sea - Wikipedia, the free encyclopedia (495 words)
Yoldia sea is a name given by geologists to a variable brackish-water stage in the Baltic sea basin that prevailed after draining of Baltic ice lake had reduced the lake level to then sea level.
The sea came to an end when isostatic rise of Scandinavia closed or nearly closed its effluents, altering the balance between saline and fresh water.
The sea as an ecologic system came to an end when Scandinavia rose sufficiently to block the flow through the Stockholm area and the saline balance shifted toward a lacustrine ecology once again.
Baltic Sea - Wikipedia, the free encyclopedia (3197 words)
The Baltic Sea's salinity is much lower than the ocean's, as a result of abundant freshwater runoff from the surrounding land; indeed, runoff contributes roughly 1/40th its total volume.(Alhonen 88) It varies from 0.1% in the north to 0.6-0.8% in the center.
Lands next to the sea's eastern shore were among the last in Europe to be converted into Christianity in the Northern Crusades: Finland in the 12th century by the Swedes, and what are now Estonia and Latvia in the early 13th century by the Danes and the Germans (Livonian Brothers of the Sword).
After 1945 the sea was a border between opposing military blocks: in the case of military conflict in Germany, in parallel with a Soviet offensive towards the Atlantic Ocean, communist Poland's fleet was prepared to invade the Danish isles.
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