During an expedition to the Lake District, led by Miss Elles, the contact of the Threlkeld microgranite with the rocks into which it has been intruded was examined. The lower contact of the microgranite with the Skiddaw Slates is now well exposed at the eastern end of the main quarry south of Threlkeld railway station; and also in the light-railway cutting connecting this quarry with the newer quarries to the S.W. This contact is transgressive to the bedding of the slates, and at the first-named exposure the two rocks are dove-tailed into each other. The slate can be seen to be but slightly hardened and so little alteration has been effected that well-preserved graptolites were found within 18 inches of the contact.