Tillit
Tillit (from English tillite , introduced into German by Albrecht Penck ) is a rock that consists of deposits in the glacier margin area ( lateral , terminal or ground moraine ). In German, the term Tillit is only used for glacier deposits that were formed before the last, the Quaternary Ice Age , and which have become solid rock. In this sense, tillites are geologically old, already solidified boulder clay , whose formation conditions are similar to those not solidified.
In Central and Western Europe only a few tillite occurrences are known, such as in the so-called Geschwend-Sengalenkopf-unit in the Black Forest or possibly the Granville-Formation in Brittany . Are clearly visible, the well-known European Tillitvorkommen the stubbornness tables Ice Age on the Scottish island of Islay at Port Askaig and on the little north of it archipelago of Garvellachs as outcrops of Dalradian supergroup , one from the north-west of Ireland to the Scottish Highlands pulling powerful sediment layer . They are widespread on the southern continents as evidence of the so-called Permo Carboniferous glaciation of Gondwana .
Individual evidence
- ↑ Hans Murawski : Geological Dictionary. 11th edition. Spektrum, Munich 2004, ISBN 978-3-827-41445-8 , p. 224.
- ↑ Peter A. Ziegler , Wolfhard Wimmenauer : Possible Glaciomarine Diamictites in Lower Paleozoic Series of the Southern Black Forest (Germany). Implications for the Gondwana / Laurussia Puzzle. In: New Yearbook for Geology and Paleontology . Monthly Bulletins 2001, pp. 500-512 (PDF; 1662 KB).
- ↑ Nicholas Eyles, Nicole Januszczak: 'zipper Rift'. A Tectonic Model for Neoproterozoic Glaciations During the Breakup of Rodinia After 750 Ma. ( Memento from June 11, 2007 in the Internet Archive ) In: Earth-Science Reviews. Vol. 65, 2004, No. 1–2, pp. 1–73 (PDF; 4 MB), doi : 10.1016 / S0012-8252 (03) 00080-1 .
- ^ Islay Subgroup. In: BGS Lexicon of Named Rock Units (English).