Precambrian rocks in the Channel Islands
The Channel Islands provide some of the best coastal exposures of calcalkaline plutonic rocks in the British Isles. Many of these plutons, and all of the metamorphic basement they intrude, are now known to be of Precambrian age. By contrast, in Jersey, volcanic rocks and some of the plutons have yielded Lower Palaeozoic isotopic ages. Although these relatively young dates may indeed record continuing igneous activity into Ordovician times, some of them at least could prove to be reset ages. Rocks of unquestioned Phanerozoic age are confined to a cover sequence of (probably Cambrian) red sandstones and conglomerates seen on Alderney and Jersey, and several suites of dykes.
Figures & Tables
This second and completely revised edition of Special Report No. 6 provides a comprehensive review and report of work earned out since 1975. It emphasizes the relationship between, and the correlation of, the units in to which the Precambrian rocks of England, Ireland, Scotland, Wales and the Channel Islands have been divided The chapters also provide a comprehensive bibliography of the work on which the correlations have been based.