The Lias-Oolite junction in Rosedale and Farndale is defined. The underlying Lias is folded into a pre-Oolite complex of shallow Caledonoid folds, wherein are preserved about 55 square miles of Yeoyilian strata in the Cleveland region. The Rosedale East and Sheriff's Pit ironstones, now exhausted, are included on field evidence with the Yeovilian and not the Dogger. They occur in the troughs of two structural basins of limited extent in the fold complex, while other basins hold ironstones of no economic value. It is unlikely that the depositional basin of the Rosedale ironstones extended far beyond the present limits of the dale. Within Rosedale its distribution was materially reduced by erosion from the crests of minor pre-Dogger folds, pebbles now phosphatised derived from the crests occurring in the base of the Dogger.

A three-fold sub-division of the Dogger is recognized. The Glaisdale Oolite is here of little importance; the lenticular Rosedale Sandstone represents sand trapped in the continued down-warping over Rosedale in early Dogger times. The most widely spread rock group, the Blakey Series, includes the important Black Shales at its base. Marked facies variation is recognized in the sandy upper part, which includes the Ajalon facies, the Green Flag facies, etc., which were earlier incorrectly regarded as in chronological succession.

The Rosedale magnetite-oolite is regarded as a sedimentary deposit underlying the Dogger.

The petrography of the several beds of the Lias-Oolite junction is briefly described.

External characters.—Plano-convex with a moderately deep ventral valve and a plane to slightly convex dorsal valve. Outline is semi-oval with the greatest width just anterior to the long straight hinge-line. Ventral interarea, wide, long, apsacline, dorsal interarea, anacline.

Detailed drift mapping near the Gare Loch, Dumbartonshire, has confirmed that the loch was formerly occupied by a late valley glacier marking a re-advance contemporaneous with re-advances in the Loch Lomond and Upper Forth Valleys. The moraine of the Gare Loch glacier, which has been traced for some miles on both sides of the loch, locally rests on clays of the “ 100-ft.” sea and is overlain by “ 25-ft.” beach gravels.

The pediment is a widespread and fundamental landform adapted to and moulded by sheet-flow of surface water. The usually abrupt transition from hillslopes to pediments corresponds to a change in surface water flow from linear- to sheet-flow. A cut-rock surface is an essential feature, and where this is buried beneath a detrital mantle some climatic change is to be suspected.

This preliminary note records two discoveries in the Ross of Mull. Kyanite is considerably more widespread in the Moine rocks than previous investigations have indicated. Where the kyanite-gneiss enters the thermal aureole of the granite, large andalusite paramorphs are formed from kyanite.

A collection of erratics from the Boulder Clay and associated remanie drift of the Nene Valley includes distinctive sedimentary, igneous, pyroclastic, and metamorphic rocks. Localities are suggested from which these may have originated and it is concluded that the Upper Chalky Boulder Clay was brought by ice moving from a direction west of north.