James Hutton's Theory of the Earth: A Machine without a History - Time's Arrow, Time's Cycle: Myth and Metaphor in the Discovery of Geological Time - page 71

James Hutton's Theory of the Earth 71
younger than the schist, and a force of later uplift, not older and a sign of the
earth's original construction.)
Thus, as G. L. Davies argued in his masterful dissection of the empiricist myth
(1969), Hutton developed his theory in its final
Junction of granite and limestone in Glen Tilt .
a, Granite. B, Limestone. c,
Blue argillaceous schist.
Figure 3.2
A figure from the first edition of Charles Lyell's Principles of Geology (1830)
showing the famous locality where Hutton confirmed the igneous nature of
granite by finding a multitude of granitic fingers intruding into older sediments.