Lumparn
Encyclopedia
Lumparn is a large bay devoid of islands in the Main Island of Åland, Finland, bordered by Sund
to the north, Lumparland
to the east, Lemland
to the south and Jomala
to the west.
Most of the bay fills a nine kilometer wide impact crater
. The crater is estimated to be about 1000 million years old (Proterozoic
). The depression was originally believed to be a rift
. Extraterrestrial origin was first proposed in 1979, but not until 1993 was the impact structure finally confirmed. Long shatter cones have been discovered in the southwestern part of the bay. The crater is filled with sediments, between Pleistocene
sediments and crushed rapakivi granite
bedrock
there is a layer of Paleozoic
(Ordovician
) limestone
s. This makes Lumparn one of the few places in Finland where fossil
s have been found.
The bay has also previously been referred to as Lumpari in some Finnish
documents, though the Research Institute for the Languages of Finland
does not list Lumpari as in current usage.
Sund, Åland
Sund is a municipality of Åland, an autonomous territory of Finland and is very rich in history and culture and is one of the official 27 national landscapes of Finland.The municipality has a population of and covers an area of of which is water...
to the north, Lumparland
Lumparland
Lumparland is a municipality of Åland, an autonomous territory of Finland. It is the smallest municipality on mainland Åland.The municipality has a population of and covers an area of of which is water. The population density is . The municipality is unilingually Swedish.The main village is...
to the east, Lemland
Lemland
Lemland is a municipality of Åland, an autonomous territory of Finland.The municipality has a population of and covers an area of of which is water. The population density is .The municipality is unilingually Swedish.-History:...
to the south and Jomala
Jomala
Jomala is a municipality of Åland, an autonomous territory of Finland.The municipality has a population of and covers an area of of which is water...
to the west.
Impact crater
In the broadest sense, the term impact crater can be applied to any depression, natural or manmade, resulting from the high velocity impact of a projectile with a larger body...
. The crater is estimated to be about 1000 million years old (Proterozoic
Proterozoic
The Proterozoic is a geological eon representing a period before the first abundant complex life on Earth. The name Proterozoic comes from the Greek "earlier life"...
). The depression was originally believed to be a rift
Rift
In geology, a rift or chasm is a place where the Earth's crust and lithosphere are being pulled apart and is an example of extensional tectonics....
. Extraterrestrial origin was first proposed in 1979, but not until 1993 was the impact structure finally confirmed. Long shatter cones have been discovered in the southwestern part of the bay. The crater is filled with sediments, between Pleistocene
Pleistocene
The Pleistocene is the epoch from 2,588,000 to 11,700 years BP that spans the world's recent period of repeated glaciations. The name pleistocene is derived from the Greek and ....
sediments and crushed rapakivi granite
Rapakivi granite
Rapakivi granite is a hornblende-biotite granite containing large rounded crystals of orthoclase mantled with oligoclase. The name has come to be used most frequently as a textural term where it implies plagioclase rims around orthoclase in plutonic rocks...
bedrock
Bedrock
In stratigraphy, bedrock is the native consolidated rock underlying the surface of a terrestrial planet, usually the Earth. Above the bedrock is usually an area of broken and weathered unconsolidated rock in the basal subsoil...
there is a layer of Paleozoic
Paleozoic
The Paleozoic era is the earliest of three geologic eras of the Phanerozoic eon, spanning from roughly...
(Ordovician
Ordovician
The Ordovician is a geologic period and system, the second of six of the Paleozoic Era, and covers the time between 488.3±1.7 to 443.7±1.5 million years ago . It follows the Cambrian Period and is followed by the Silurian Period...
) limestone
Limestone
Limestone is a sedimentary rock composed largely of the minerals calcite and aragonite, which are different crystal forms of calcium carbonate . Many limestones are composed from skeletal fragments of marine organisms such as coral or foraminifera....
s. This makes Lumparn one of the few places in Finland where fossil
Fossil
Fossils are the preserved remains or traces of animals , plants, and other organisms from the remote past...
s have been found.
The bay has also previously been referred to as Lumpari in some Finnish
Finnish language
Finnish is the language spoken by the majority of the population in Finland Primarily for use by restaurant menus and by ethnic Finns outside Finland. It is one of the two official languages of Finland and an official minority language in Sweden. In Sweden, both standard Finnish and Meänkieli, a...
documents, though the Research Institute for the Languages of Finland
Research Institute for the Languages of Finland
The Research Institute for the Languages of Finland is a governmental linguistic research institute of Finland geared at studies of Finnish, Swedish , the Sami languages, Romani language, and the Finnish Sign Language....
does not list Lumpari as in current usage.
