There are wide divergencies between the views of different authors as to the correlation of the Jamaican Cretaceous rocks, the extreme views being (a) that the range covered is Albian to Turonian, and (b) that the rocks are mainly or wholly Maestrichtian in age.

An examination of all known occurrences of the rudist genera Barrettia and Titanosarcolites in the Antillean and Central American area suggests that the oft-repeated statement that these two genera occur in association is erroneous. In Jamaica the Barrettia Limestone lies at least 2,500 ft. below the Titanosarcolites Limestone.

Six palaeontological zones may be recognized in the Cretaceous of Jamaica, each containing its own peculiar assemblage of fossils, and with very few species common to two zones. Evidence is brought forward that only the highest part, comprising the uppermost two zones, should be included in the Maestrichtian, that the underlying shale is Campanian, that the Barrettia Limestone and associated shales are Turonian, and that the lowest zone at present known is Cenomanian.

A statement by Jeffreys that the Wegener fit of South America and Africa is a misfit of 15° has been widely quoted and accepted. However, careful check by any rigorous method will show that these continents do in fact fit together as precisely as their forms can be defined. Whether continental drift be true or false, this argument against it must be abandoned.

One new and several re-interpreted species of Lower Cretaceous age are included in Pyrobolospora, a new organ-genus of large spores bearing neck structures; in Triletes (section Aphanozonati) are placed two other species of megaspores, one emended and one new. These are a small part of a distinctive Wealden assemblage of plant microfossils, which represents a critical period in plant evolution and which should play its part in stratigraphy. Certain difficulties in nomenclature and morphology are discussed.

The sequence of Upper Carboniferous rocks in the outlier at the western end of Stainmore Pass is described. The Upper Yoredale Series is shown to be separated by an unconformity from the overlying “Millstone Grit” series. The Coal Measures are about 800 feet thick and appear to be unconformable on the “Millstone Grit”. Hitherto unrecorded non-marine faunas and floras indicate horizons near the base and at the top of the Modiolaris zone. The sequence of Upper Carboniferous rocks at Stainmore is briefly compared with those of surrounding coalfields.

Geometry of the boundary of the serpentine in the south-east Lizard indicates that it is a sheet. The serpentine sheet rests on hornblendic gneisses and their migmatized equivalents; the upper part of this basement represents a thrust-sole in which bodies torn from the base of the serpentine are enclosed. Coastal erosion of rocks beneath the serpentine tends to marginal collapse of the unsupported sheet, so that slipped masses may conceal its base.

Recent work in the Middle Shire Valley has revealed a swarm of biotitite bodies emplaced in gneisses and granulites of the Basement Complex. The rocks of the Basement Complex are described briefly and referred to the Amphibolite and Granulite Facies of regional rnetarnorphism. The field relations, distribution, and petrology of biotitite bodies show that they are a series of metamorphosed ultrabasic intrusions. An occurrence is described in which hydrothermal agencies have altered biotitite to vermiculite rock.

Fish remains from the Wijde Bay Series of the Wijdefjorden area include (1) pteraspids, not previously recorded from so high an horizon, which appear to bear sensory canals upon the exterior surface of the ventral disc; (2) an Asterolepis, and (3) rhizodontid scales, resembling those of Holoptychius. A very large antiarch from an unknown horizon is also recorded.