The chief metamorphic minerals are described and, in addition to those reported by Lamplugh, cordierite (at scattered localities along the structural axis) and staurolite (at Glion Darragh, Archal-lagan) are found to occur. The distribution of metamorphic minerals recorded by Lamplugh is confirmed. The age relation of the new minerals to the movements is deduced from microscopic evidence. This is: early folding and development of biotite; relaxation of stress and development of cordierite; shearing and recrystallization of biotite along planes of fracture-cleavage; high grade metamorphism at Archallagan which outlasted the fracture-cleavage movements.

It is concluded that the postulate of a buried granite beneath the axial belt most readily accounts for the distribution of the metamorphism.

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.

A swarm of basaltic and camptonitic dykes in the Northern Highlands of Scotland has been studied. The dykes include monchiquite, olivine basalt, olivine dolerite, and camptonite, and a study of the relations of the various types in individual dykes suggests that the camptonites have arisen by the crystallization of late fractions from a magma of fairly normal dolerite type.

The relations of the genera Torynifer Hall and Clarke, Phricodothyris George, and Kitakamithyris Minato are discussed, and the diagnosis of Phricodothyris emended. The phricodothyrid species of New South Wales all bear dental lamellae and a median septum in the pedicle valve. Four new species from three horizons within the Carboniferous are described.

Deformation of plastic kaolinite-illite clay caused alignment of authigenic prisms of rutile and tourmaline on surfaces produced by parallelism of the basal pinacoids of the clay-minerals. An a–lineation appeared in the outer layers of an extruded cylinder but a b–lineation in those of a cylinder formed by rolling. A Wineation occurred at the periphery of a circular disc made by spreading. Localized tensional failures, cognate with ac joints, accompanied the b–lineations which were in directions of elongation. The orienting movements were thought to occur in the water-films separating the clay-flakes, but the mechanisms which produce a– and b–lineations are presumably identical. Thus it can be argued that the a–lineation also follows a direction of elongation.

Sillimanite produced by the contact action of the Donegal Granite shows varied textural and time relationships with the other minerals of the schists in which it occurs. Early Sillimanite was formed in the main stage of metamorphism by destruction of biotite, K, Fe, and Mg being expelled in the process. A later influx of new K from the granite led to the growth of muscovite metacrysts. This was associated with destruction of part of the early Sillimanite, recrystallization of part, growth of a new crop of Sillimanite needles, and formation of muscovite-sillimanite intergrowths.

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.

Some Mesozoic spores and pollen grains claimed in a recent publication to exhibit angiosperm-like features are discussed. It is suggested that Poroplanites Pflug, is actually a trilete fern spore. The “ germinal apparatus ” of the Poroplanites type is simply an optical section of the characteristic folding of a lobe of a trilete spore, flattened along the polar axis and seen in equatorial view. It is shown that Pflug's Poroplanites type can be reproduced almost exactly in the trilete spores of a living tree fern. Classopollis Pflug, Circumpollis Pflug, and Canalopollis Pflug are pollen grains with distinct annular thickening, similar to the pollen grains of the Jurassic araucarian, Pagiophyllum connivens Kendall.

A Basement Complex graphite-limestone on Changalumi Hill, along the eastern escarpment of the Southern Nyasaland rift-valley, exhibits various phenomena including contorted exotic boulders, migration of graphite, and injection of discordant veins into adjacent gneiss. These features indicate that the limestone has burst through its anticlinal roof during strong isoclinal folding at a relatively low temperature, engulfing and distorting a minor synclinal infold. The age of the break-through is proved to be pre-Chilwa Series and pre-Rifting.

The calciphyres and granulites near Nanjangud in Mysore were examined in detail in view of the reported occurrence in them of a remarkable assemblage of rare minerals of the Sanidinite fades. A brief field examination disclosed the absence of Gabbrolimestone contacts previously reported. The calciphyres and calc-granulites occur as layers, lenses and nodules in a group of amphibolites and hornblende granulites. Thin sections of these granulites display cataclastic textures indicative of shearing, and crushing. They are found to be composed of minerals characteristic of high grade marbles, and the absence in them of such minerals as larnite, merwinite and spurrite recorded previously, is consistent with the present field observations.

The structure and flow-layering of a granodiorite dyke, as seen in extensive quarry exposures, are described and related to quarrying directions and the regional tectonic pattern.

An area of rocks in S.E. Co. Wexford, the age of which has not been previously established, is now shown to be a metamorphic assemblage, probably of Pre-Cambrian age. It is suggested that this formed the south-western extension of the L. Palaeozoic Irish Sea geanticline postulated by previous workers.

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.

This genus is not present in pre-Oligocene rocks and probably does not occur below the basal Miocene. Stratigraphical and micropalaeontological evidence is produced to support this statement.

Numerous specimens of Lingula tenuissima Bronn have been discovered in the Lower Keuper near Eakring, Notts. Earlier records of fossil bivalves in this formation are recalled and the implications of the present find discussed in relation to conditions of deposition of the Keuper.

The new species Echinotiara arabica is described and referred to the family Stomopneustidae Meissner, 1903. It is compared with other Liassic species of “Stomechinus” which are considered to be congeneric with it, and its relationships with the genera Stomechinus, Psephechinus and Jeannetia are discussed.

Two species of Argyrotheca new to this country are recorded from the type Bracklesham Beds, and a full description given of the associated Terebratulina edwardsi, previously known from immature specimens only. The British Eocene brachiopods are listed, and the ecological significance of their rarity and distribution briefly discussed.

In the Clashnessie district the original or Scourian complex is represented chiefly by hornblendic gneisses and shows simultaneous close folding on 55°–235° (A 1) and 155° (A 2) axes. The general disposition of the formations is largely related to open folding on the A 1 axis.

The effects of later movements, post-dating the basic dykes, are comparatively slight, but are shown by the sporadic development of a schistosity and a lineation, which plunges to the south-east, together with occasional sharp folds at about 207° (A 3) and 114° (A 4).

The mode of occurrence and petrography of a group of pyroxene- hornblende-granulites (beerbachites), found only in association with serpentinized peridotite, are described. The beerbachites are regarded as contact altered lavas and basic intrusions which formed the lower levels of a thick series of Ordovician volcanics. Peridotite, intruded into the base of the volcanic pile, disrupted and thermally metamosphosed the lavas and intrusions which appear as inclusions in the serpentinized peridotite. The present contacts between serpentinite and adjacent unmetamorphosed rocks are secondary in origin.

The cardinal process in the Productidae is divided into two main types, either bi- or trilobed. The process in several species, illustrating each type, is described and figured, and the development of both types compared.