Tvären
Tvären is a circular bay close to Studsvik, Sweden.
Within the bay is an ancient buried impact crater about 2 kilometres (1.2 mi) in diameter. It was first identified using reflection seismology. The crater is estimated to be about 455 million years old (Late Ordovician).
Asteroid 7771 Tvären is named after the bay.
References
- ^ "Tvären". Earth Impact Database. Planetary and Space Science Centre University of New Brunswick Fredericton. Retrieved 2009-08-20.
- ^ Flodén, Tom; Tunander, Pål; Wickman, Frans E. (1986). "The Tvären Bay structure, an astrobleme in southeastern Sweden". Geologiska Föreningen i Stockholm Förhandlingar. 108 (3): 225–234. doi:10.1080/11035898609454687.
58°46′N 17°25′E / 58.767°N 17.417°E
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