It was the discovery of erratic boulders
made of rock quite different from the surrounding landscapes which led scientists to devise the theory of Ice Ages in the 1830s and 1840s.
Owens (Cardiff) review the distribution of the trilobite order Proetida in the Ordovician of Baltoscandia and in glacial erratic boulders
found in northern Germany and adjacent areas.
Zeles, Latvia)--was undertaken to date deposits and landforms of the Scandinavian ice sheet in Belarus, Poland, Lithuania, Latvia, and Estonia, mainly by dating key organic-bearing units by AMS radiocarbon and erratic boulders
on moraine surfaces using cosmogenic nuclides ([sup.
Silicified erratic boulders
and, usually more or less rectangular, siliceous Ordovician limestone boulders in the Berlin area were referred to as 'Backsteinkalk', after the characterization of 'certain brick stones' by K16den (1834).
It is now used as a standard procedure of determining exposure ages of erratic boulders
and the respective moraines (e.
The middle, most argillaceous part of the Vormsi Stage contains the endemic saukrodictyid brachiopod Hulterstadia cor (Wiman), known previously only from erratic boulders
on the Island of Oland (Sweden) (Wiman 1907; Harper 2000).