Geological Guide to the Lockne
& Dellen Impact Structure

By Maurits Lindstrom & Ilka von Dalwigk
December 2002
Almqvist & Wiksell International
ISBN: 91-22-01976-6
45 pages, Illustrated, 8 1/4" x 11 1/2"
$46.50 Paper Original

The Lockne crater formed through the impact of a giant meteorite into a long-established sea about 455 million years ago, that is, in Middle Ordovician time. The crater is situated in central Sweden. The geological age of the crater is given precisely by the youngest marine deposit affected by the impact, and thus laid down before the event, and the oldest local deposit after the impact. Although crater features are extraordinarily well preserved in the surface outcrop, there is surprisingly little crater to be seen in much of the landscape. The Lockne crater is one of the most important geological features of the region, especially for the thriving community of Tandsbyn. The central morphologic crater is a still-important site of agriculture. The pleasant view of a wide open surface of land and lake inside a girdle of hills is the direct result of the great impact.

Stockholm Contributions in Geology, Vol. 47

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