Chitinozoan biostratigraphy of the early Caradocian Lockne impact structure,Jämtland,Sweden |
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| Authors: | YNGVE GRAHN |
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| Abstract: | Abstract— The chitinozoan biostratigraphy in seven outcrops and four drilling cores in connection with the Lockne impact structure has been investigated. The impact event took place in early Caradoc (i.e., ～460.4 Ma ago) and in beds corresponding to the lower part of the Lagenochitina dalbyensis Zone (upper Dalby Limestone). The contact between the impact-related rocks and the secular postimpact sediments can be traced all over the impact structure, and up to a distance of 50 km away from the presumed crater center. The youngest postimpact sediments in the Lockne impact structure correspond to the lower Örå Shale (Belonechitina hirsuta Zone). |
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