In the valley of Reykjafjordur, on the eastern flank of Drangajokull in NW Iceland, there are two groups of recessional or readvance terminal moraines. The older moraines (numbered in the O sequence) are Late Glacial or Neoglacial in age (several thousand years old) and the younger ones all date from the surges or readvances in the Little Ice Age -- within the past 300 years.
These satellite images are useful in seeing the relationships:
Annotated image showing what appear to be two morainic loops in close proximity. In 1975 we labelled these O1 (outer) and O2 (inner). We also called them the first and second Kirkjubol stages. The outer one might be the equivalent of the Jokulgardur moraine in Kaldalon, and the inner one might be the equivalent of the Kegsir moraine, which appears itself to be a double moraine in Kaldalon. Further fieldwork and dating is required to sort out what has been going on here............
No comments:
Post a Comment