Tillite

A Tillit (of English. Tillite, introduced into German by Albrecht Penck ) is a rock, which is made in the edge of the glacier area ( side, end or ground moraine ) deposited rock material. However, the German term tillite is used only for those glacial deposits, which arose prior to the last Quaternary Ice Age and solidified into solid rock. Tillites are geologically old glacial till in this sense. The formation conditions of both rocks are, however, identical.

In Central and Western Europe only a few Tillitvorkommen are known, for example from the so-called Geschwend - Sengalenkopf unit in the Black Forest or possibly the Granville Formation in Brittany. Leading European occurrence of tillites ( Stur tables ice age ) are found in the outcrops of Dalradian supergroup on the Scottish island of Islay in Port Askaig and the somewhat north of it Garvellach Islands. Widespread they are, however, on the southern continents as a testimony of the so-called Permo - Carboniferous glaciation of the former Gondwana continent.