Geological work and drilling in the Western Uganda Rift since 1939 points wholly to the formation of this feature by gradual sinking of the floor. No evidence of compression has been obtained.

New floral and lithological evidence from the tongue of Coal Measures extending from the Wyre Forest Coalfield into the northern part of the Abberley Chain establishes that the eastward overturning along the Malvern axis is of late- or post-Morganian age. Minor folding along this axis may have taken place prior to the deposition of the Upper Coal Measures. This, however, had little topographic effect as during the deposition of the Upper Coal Measures the northern end of the Malvern axis remained an area of relatively rapid subsidence.

White marble in Glen Dessarry, West Highlands of Scotland, occurs as three lenses associated with schists and calc-silicate rocks. The minerals identified in all these rocks are apatite, biotite, calcite, chondrodite, clinochlore, clinozoisite, diopsidic-pyroxene, dolomite, epidote, forsterite, garnet, hornblende, magnetite, phlogopite, plagioclase, potash-feldspar, pyrites, quartz, scapolite, sillimanite, sphene, vesuvianite, zoisite.

Two parageneses may be distinguished. One, due to high-grade regional metamorphism, apparently with little or no introduction of material, is a diopsidic-pyroxene, forsterite, phlogopite, calcite, dolomite association forming white marble. The other association occurs as veinlets and small irregular bodies in the white marble. It appears to be due to circulating solutions in which pyroxene and forsterite were unstable. Minerals of this paragenesis include potash-feldspar, plagioclase, scapolite, hornblende, minerals of the epidote group, calcite, and quartz. In certain localities scapolite formed at the expense of plagioclase and was succeeded by crystallization of epidote.

The best known exposures of Rhaetic strata in Glamorgan are those of the Lavernock and Penarth cliff sections, where the normal black shales—thin limestones facies are displayed. In the central and west Vale of Glamorgan, however, massive sandstones are the dominant Rhaetic formation. The construction of a housing site has revealed the presence of numerous voids or cavities in these sandstones, the origin of which is attributed to decalcification.

A description is given of a nearly complete specimen of a new Ordovician eurypterid genus belonging to the family Stylonuridae. The classification of the Eurypterida is discussed; two super-families and two new families are proposed and three new names substituted for pre-occupied generic names.

It is shown that mylonite is extremely rare in the plane of the Great Glen fault, and that horizontal slickensides or friction-grooves directed along the Glen are virtually absent. Grave doubt is consequently thrown on the alleged horizontal displacement in the fault zone.

A description is given of an intergrowth between augite and albite found in Spilitic lavas from King Island, Tasmania. Hydrogrossular is found pseudomorphing olivine and also in veins and vesicles in certain rocks of the same volcanic suite.

Marked differences in relative abundance of right and left valves of certain recent lamellibranchs are recorded in collections made along beaches of eastern Trinidad, and a possible explanation is discussed.

Comparison of the Suffolk coast with dated large-scale Ordnance Survey maps indicates regions where noticeable erosion or accretion has occurred during the past quarter of a century. It is important to establish why and how the incidence of erosion varies with time and place.