- Source: Fur Formation
The Fur Formation is a marine geological formation of Ypresian (Lower Eocene Epoch, c. 56.0-54.5 Ma) age which crops out in the Limfjord region of northern Denmark from Silstrup via Mors and Fur to Ertebølle, and can be seen in many cliffs and quarries in the area. The Diatomite Cliffs (moler in Danish) is on the Danish list of tentative candidates for World Heritage and may become a World Heritage site. Fossils found in the Fur Formation are primarily housed at the Fossil and Mo-clay Museum on Mors Island, the Fur Museum on Fur Island, and the Natural History Museum of Denmark (formerly named Geological Museum) in Copenhagen.
Geology
The Fur Formation is a unit of diatomitic sediment approximately 60 meters thick consisting of diatoms and clay minerals with up to 180 layers of volcanic ash. In Danish literature the formation has informally been referred to as the moler (Ler means clay). The diatomite comprises 2/3 opal tests of diatoms and 1/3 clay, interbedded with layers of volcanic ash and a few limestone horizons ('cementstones'), and has exceptionally complete fossil preservation.
It is known for its abundant fossil fish, insects, reptiles, birds and plants. The Fur Formation was deposited just above the Palaeocene-Eocene boundary, about 55 million years ago, and its tropical or sub-tropical flora indicate that the climate after the Paleocene-Eocene Thermal Maximum was moderately warm (approximately 4-8 degrees warmer than today).
Glacial activity has moved and folded all exposed moler in a complicated pattern which permits very precise mapping of glacial movement at the end of the last ice age, and has, due to the ash layers, created an extraordinary pedagogical case for studying tectonics.
= Members
=The Fur Formation is divided into two members:
The lower Knudeklint Member was named for a location on the island of Fur. The upper Silstrup Member was named for a location in Thy. The stratigraphy exposed at Knudeklint constitutes the unit that containing the Paleocene/Eocene boundary informally named Stolleklint Clay, which grades up into the Fur Formation.
Paleontological significance
Fossils of great diversity and unique preservation (only 10 my. after the 'great extinction' of dinosaurs, ammonites etc.) Most unusual, if not unique, diversity of life from both ocean and land with extremely good preservation of details rarely seen, therefore very reliable reconstruction of palaeobiology. By far most of the "Danekræ" fossils (fossils that are considered of national importance and covered by a special law) since 1990 have been found in the Mo-clay area.
= Birds
=The earliest Paleogene fauna of any diversity, over 30 species, including some near complete, some preserved in 3-D, and some excellent bird-fossils (even with feathers and chromatine). Most are earliest known representatives of their orders (e.g. Trogons, Swifts, Ibises) and all are terrestrial birds.
†Lithornithiformes
Galliformes
Gruiformes
Rallidae
†Messelornithidae
Apodiformes (Swifts)
Charadriiformes
Psittaciformes
Musophagiformes
Coliiformes
Strigiformes
Caprimulgiformes
Coraciiformes
Trogoniformes
Primoscenidae
Trogonidae
†Septentrogon madseni
= Reptiles
=Several fossil sea turtles are known from the Fur Formation. In one of them, a large leatherback turtle (Eosphargis breineri) remains of soft tissue and skin pigmentation have been recovered A number of well-preserved turtle specimens have been recovered from the formation, two of which have been recognized to be a completely new species of the genus Tasbacka.
Sea snakes are also known from the formation.
Palaeophis (Sea snake)
Eosphargis brenieri (Leatherback turtle)
Cheloniidae and pan-Cheloniidae
†Puppigerus
Glarichelys
Tasbacka
= Fish
=Large teleostean fauna, oceanic, possibly including earliest truly deepwater fish, a 'whale-fish'; earliest members of many living families and Tertiary diversity preserved as complete skeletons; some rare and sensational large and complete specimens (two 'bonytongues', one tarpon).
The following taxa are known:
= Insects
=Huge fauna from land, over 200 species, many are oldest of their families; many with colour spots and eye lenses, some extraordinary preservation with stridulation (sound) apparatus in grasshoppers, and apparently migratory moth mass mortality.
Species described include:
Cimbrochrysa moleriensis - a green lacewing
Cimbrophlebia bittaciformis - a Cimbrophlebiid scorpionfly
Danochrysa madseni - a green lacewing
Forficula paleocaenica - a forficulid earwig
Furochrysa alisa - a green lacewing
Limfjordia breineri - a dictyopharid plant hopper
Rhantus villumi - a water beetle
Stephenbrooksia multifurcata - a green lacewing
Ypresiomyrma rebekkae - a bull dog ant
= Crustacea
=Extraordinary cirripeds (barnacles), and the only fossil shrimps from Denmark.
= Molluscs
=Gari sp.
Mytilus sp.
Nucula sp.
= Land plants
=Some members of the 'Arcto-Tertiary flora'; some with cuticle preservation and some flowers preserved. Large silicified trunks (up to 9 m) of redwood, and some very soft wood preserved. Some trunks with mussels and barnacles attached. Many seeds and fruits.
= Diatoms
=Great diversity of unicellular, marine algae with siliceous (opal) tests, 130 species.
Ash layers
More than 200 layers of volcanic ash of predominantly basaltic composition have been found within the Mo-clay of the Fur Formation. 179 of the most prominent ash layers have been numbered. Comparison with volcanic ash layers in oil wells in the North Sea indicates that the Mo-clay is coeval with the Sele Formation and Balder Formation in the North Sea. The ash layers have also been found at other sites in Denmark, England, Austria and the Bay of Biscay.
The total eruption volume of this series have been calculated as 21,000 km3, which occurred in 600,000 years. The most powerful single eruption of this series took place 54.0 million years ago (Ma) and ejected ca. 1,200 km3 of ash material, which makes it one of the largest basaltic pyroclastic eruptions in geological history.
See also
List of fossiliferous stratigraphic units in Denmark
References
External links
Kata Kunci Pencarian:
- Globalisasi
- Dua Belas Nabi
- Mazhab Frankfurt
- Noretisteron
- Daftar Kanselir Jerman
- Agama Hindu
- Petra
- Kafeina
- Dolomit
- Megalodon
- Fur Formation
- Fur (disambiguation)
- Fur (island)
- Mors (island)
- Gryllidae
- Fur
- List of rock formations
- Parrot
- Osteoglossiformes
- 2024 in paleoentomology
