File:GSG GLA FIG 09 01.jpg

English: Figure 9.1 Showing the relationship between the uplift of a basement and the accumulation of the sediments, sand and gravels, which have been eroded off it. The basement in this example has been thrust over the sediment pile which has accumulated in a basin which is to the right in the diagram. Gravels accumulate near to the source and sands further away. The volume of material removed from the basement is represented by the envelope in dotted lines; the present land surface exposes the metamorphic zones, with the lowest (GS=green-schist) going via E=epidote–amphibolite facies; AA=lower amphibolite facies, to MA=middle amphibolite facies (the highest). The times at which the rocks cooled are given in Ma= millions of years, and the thick lines join all points which cooled at the age given. In the example illustrated the centre of the basement pile was uplifted first (it has the oldest ages of 500Ma) and from this region there was the greatest removal of overlying rock.

From: Lawson, J.D. and Weedon, D.S. (editors). 1992. Geological excursions around Glasgow & Girvan. Glasgow : Geological Society of Glasgow.