The study of the igneous complex of which the Marysville rocks form a part was begun by the writer in 1928, when he first recognized the acid lavas that form the summit of the Blue Hills east of Taggerty, and practically coincide with the edge of the State Forest Reserve extending eastwards from there among the Cerbereans. Although only a small part of the truly enormous mass of igneous rocks was dealt with at that time, it was clear that interesting stratigraphical and petrological results might be obtained by a more detailed survey, and field work was therefore undertaken at Marysville, some 15 miles south of Taggerty, in 1929.

THE question whether the Permian Shell Limestone Bryozoa Reef of the Middle Magnesian Limestone exists below the Upper Magnesian Limestones in the Hartlepool district was answered in the affirmative about two years ago, when a boring was sunk to a depth of 225 feet at West Hartlepool Waterworks (W on the sketch-map).

AS it is unlikely that we shall have an opportunity of collaborating in further work on the Pleistocene deposits of the Cambridge area, we wish to add some short notes to our earlier work.

The island of North Rona bears, on the whole, a close resemblance in structure to the adjacent mainland, with certain distinct minor differences.

The evidence shows that the island probably came under the influences of the quaternary ice, as was suggested by Geikie.