Ordovician impact crater at Kärdla, Hiiumaa Island, Estonia.

Details Ordovician impact crater at Kärdla, Hiiumaa Island, Estonia. Ordovician impact crater at Kärdla, Hiiumaa Island, Estonia.

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992tectp.216..143p&link_type=abstract

Tectonophysics, Vol. 216, No. 1/2, p. 143 - 156

Physics

16

Scientific paper

The buried and well preserved Kärdla crater in Estonia (Southern Fennoscandia) (58°59'N, 22°40'E), with a diameter of approximately 4 km, was discovered in 1967. The subsurface structure of the crater has been studied by gravity anomaly measurements, aeromagnetics and by more than 300 boreholes in the crater, on the rim ("ring wall") and in the surrounding area. The crater formed 455 Ma in composite stratigraphy: middle and lower Ordovician (20 m) and Cambrian (120 m) sedimentary rocks overlying crystalline basement on the bottom of a shallow nearshore sea. The subsurface structure of the crater is well preserved. Shocked rocks and minerals from autochthonous and allochthonous breccias have been revealed by optical microscopy.

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