Catastrophism and uniformitarianism are opposite extremes which must be combined and reconciled.
I have spoken of uniformitarianism as the doctrine of Hutton and of Lyell.
Thus arose the extreme opposite doctrine of uniformitarianism.
So far as the not-living world is concerned, uniformitarianism lies there, not only in germ, but in blossom and fruit.
The limitations implied in these passages appear to me to constitute the weakness and the logical defect of uniformitarianism.
On first thought it might seem that such lawless movement was rather in keeping with catastrophism than uniformitarianism.
To my mind there appears to be no sort of necessary theoretical antagonism between Catastrophism and uniformitarianism.
This view is a complete reconciliation of catastrophism and uniformitarianism, and is far more rational than either extreme.
And if that is so, uniformitarianism, even as limited by Lyell, has no call to lower its crest.
This is the true "uniformitarianism" of geology which holds to the dominion of existing causes from the first.
The theory that all geologic phenomena may be explained as the result of existing forces having operated uniformly from the origin of the Earth to the present time. See Note at Lyell.