Hulterstadia cor and associated taxa, common in the Hulterstad Fauna of the erratic boulders
on Oland, or related to it, occur in the Lelle section in the Fungochitina spinifera chitinozoan Zone, in the middle part of the Vormsi Stage.
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.
The AONB also includes Castle Ring, an Iron Age hill fort, which is the highest point on the Chase, and several glacial erratic boulders
that are the remnants of glaciation, including one that's mounted on a plinth.
Freek Rhebergen (Emmen) discusses Baltic Ordovician sponges (Porifera) recovered from erratic boulders
in Neogene fluvial deposits of The Netherlands and northern Germany.
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.10]Be and [sup.26]Al) in quartz.
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).