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The limited amount of fission track data previously available in Northern Britain has shown unexplained Cretaceous ages in the Southern Uplands and Lake District.
Apatite fission track analysis has been applied to 23 samples from Caledonian intrusive bodies, to further investigate these ages.
This variation in fission track age is accompanied by changes in the distribution of confined fission track lengths.
Samples with the youngest ages (∼ 60 Ma) have long, narrow distributions (mean length 14 μm; standard deviation ∼ 1 μm) typical of samples which have had all pre-existing tracks erased by elevated temperatures, and subsequently cooled rapidly so that all tracks now observed have formed at low temperatures.