Published online by Cambridge University Press: 01 May 2009
The results obtained of late years, through the numerous investigations which have been carried on amongst the Pre-Cambrian rocks in Great Britain, combined with the important discoveries of many additional areas to those previously known, seem to require that some general attempt should now be made to correlate the principal groups where they have been observed; and to classify them according to the prevailing types of rocks recognized therein, and peculiarities observable.
1 Read at the Meeting of the British Association at Sheffield, 1879.