Neugrund crater
| Neugrund crater | |
|---|---|
| File:GneissBoulderOsmussaar.jpg Boulder of gneiss breccia on Osmussaar, Estonia, possibly thrown there by the Neugrund impact | |
| Impact crater/structure | |
| Confidence | Confirmed |
| Diameter | 8 km (5.0 mi) |
| Age | ~535 Ma Cambrian |
| Exposed | No |
| Drilled | - |
| Location | |
| Location | Baltic Sea |
| Coordinates | Lua error in Module:Coordinates at line 489: attempt to index field 'wikibase' (a nil value). |
| State | Estonia |
| District | Lääne County |
| Lua error in Module:Location_map at line 411: Malformed coordinates value. | |
Neugrund is a meteorite crater in Estonia. It is 8 km (5.0 mi) in diameter and was previously estimated to have been formed in the Ordovician around 470 Ma, with later research revealing a possible Cambrian origin (around 535 Ma). The crater is at the bottom of the sea and is not exposed at the surface. Boulders of gneissic breccia found on the coast of Osmussaar, a nearby island, are believed to have been thrown there by the explosion.[1] It has been proposed that the Neugrund crater was created during the Ordovician meteor event when a hypothetical large asteroid transferred directly into a resonant orbit with Jupiter, which shifted its orbit to intercept Earth.[2][3][4]
This attractive theory may need to be changed as more recent study puts the age of the impact in the Cambrian.[5]
See also
[edit | edit source]References
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- ^ Korochantseva et al. "L-chondrite asteroid breakup tied to Ordovician meteorite shower by multiple isochron 40Ar-39Ar dating" Meteoritics & Planetary Science 42, 1, pp. 3-150, Jan. 2007.[dead link]
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