Ilek Formation
Geologic formation in Western Siberia, Russia / From Wikipedia, the free encyclopedia
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The Ilek Formation is a Lower Cretaceous geologic formation in Western Siberia. Many different fossils have been recovered from the formation. It overlies the Late Jurassic Tyazhin Formation and underlies the Albian Kiya Formation.[1]
Ilek Formation | |
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Stratigraphic range: Lower Cretaceous, Barremian–Aptian | |
Type | Geological formation |
Unit of | Kiya River Basin |
Underlies | Kiya Formation |
Overlies | Tyazhin Formation |
Thickness | Up to 746 metres (2,450 ft) |
Lithology | |
Primary | Clay, siltstone |
Other | Marl, sandstone |
Location | |
Coordinates | 55.9°N 88.0°E / 55.9; 88.0 |
Approximate paleocoordinates | 54.2°N 84.6°E / 54.2; 84.6 |
Region | Western Siberia |
Country | Russia |
Extent | Kemerovo Oblast |
Type section | |
Named by | L. A. Ragozin |
Year defined | 1935 |
The formation was described by L. A. Ragozin in 1935. It consists of sands with sandstone concretions, layers of silts, clays and marls.[2] Age of the formation, according to a crude 1962 estimate, is Valanginian(?) - Hauterivian - Barremian. Its thickness varies greatly, reaching 746 m in Teguldet borehole.[3] A more recent 2024 estimate based on invertebrate and vertebrate fossils placed the age of the formation at Barremian–Aptian.[4]