Numerous small lakes in the Naini Tal region of Kumaon have long attracted attention but no satisfactory explanation of their origins has been presented. The various lakes did not all originate in the same way in spite of their proximity, but there must be common underlying conditions to explain the abundance of lakes in this small area. These conditions appear to be the very recent and very local irregular uplift of a mass of diverse lithological units riding over an irregular sub-thrust surface.

In previous reconstructions of Gondwanaland the Falkland Islands have been placed in a position intermediate between the Cape Province and Northern Argentina. In the present paper it is suggested on structural, tectonic, and stratigraphical grounds that it would be preferable to position the Falkland Islands due east of the Eastern Province coast, thus completing the truncated Karroo Basin, the missing part of which has until now been suspected to be concealed beneath the ice-capped Queen Maud Land, Antarctica.

Thermal metamorphism of Silurian sediments at a gabbro contact took place under pyroxene-hornfels facies conditions. The most common hornfels is essentially composed of pyroxene and labradorite; its chemical composition compares with that of average gabbro. The hornfels is believed to have been metasomatically altered, probably basified, during metamorphism.

The occurrence of large blocks of fossiliferous Cretaceous limestone among the Lower Cretaceous shales of the Central Range area of Trinidad, B.W.I., has been known for many years, and several different modes of origin have been advanced. A critical exposure which shows the field relationships between the shales and limestone blocks is described, from which it is concluded that the limestone blocks were derived from the contemporaneous breaking up of limestone reefs, and the inclusion of such blocks, together with fore-reef breccia, in the adjacent shale deposits.

This paper provides field and petrographic evidence believed by the authors to indicate that the Great Glen, over a lateral distance of some 40 miles between Fort William and Foyers, is flanked on the south-east by a broad crush-belt characterized by intense cataclasis and localized mylonitization. Most of the detailed evidence has not previously been published.