Tvären

Tvären
Tvären Bay, Sweden, with Tvären impact structure indicated
Impact crater/structure
Confidence	Confirmed
Diameter	2 kilometres (1.2 mi)
Age	455 Ma
Location
Country	Sweden
Municipality	Studsvik

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).^[1][2]

Asteroid 7771 Tvären is named after the bay.

References

1. "Tvären". Earth Impact Database. Planetary and Space Science Centre University of New Brunswick Fredericton. Retrieved 2009-08-20.
2. 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