Pipe-like bodies, of granitic composition, occur in certain meladiorities in Guernsey. Their average diameter is 3 inches, and they are all similarly inclined. Some connect downwards with an acid vein system; others with a discontinuous acid layer. It is considered that the pipes were formed before the meladiorite host rocks had solidified, and that their inclination was the result of relative movement between the rocks above and below.

Sedimentary structures in the lowest sub-division of the Torridonian of Skye are described and figured. Trough cross-stratification of the type known as festoon bedding is widely developed in the coarser grits. Finer-grained sandstones show curly-bedding structures due to post-depositional disturbances. Siltstones and mudstones are characterized by a fine lamination and by such structures as ripple-marks, minute graded bedding and desiccation cracks. The orientation of cross-laminae in the festoon-bedded grits indicates that the currents depositing these rocks flowed towards the north-east or east.

A new fossiliferous section in the Coralline Crag of Suffolk is described, and its fauna is analysed as a clue to the conditions under which these beds were formed; in particular, the theory that the temperature of the Crag sea was affected by the alternate breaching and closing of land-bridges to the north and south of the North Sea area is considered unnecessary to account for the facts as seen in the field. Further, the Coralline Crag is correlated with the Astian formation of the Mediterranean, and reasons are brought forward to show that the supposed “Boytonian” Zone of the Coralline Crag does in fact not exist.

Air-heave structures have previously been described from marine lagoonal deposits, both from present day and ancient sediments. This paper records the find of such structures in playa sediments from the Scottish Old Red—perhaps the first record of such structures from non-marine sediments in the geological column. It is suggested that the structures were formed on the beaches of “Lake Caledonia”, “during a storm, seich, or a heavy rainfall”.

From assemblages of Upper Jurassic organic-shelled microplankton from Dorset are described five new species of hystrichospheres. Of these, two are attributed to a new genus, Polystephanosphaera; one new species of the genus Hystrichosphaeridium, and two of the genus Baltisphaeridium are also described.

A garnet-hornblende-two pyroxene rock from Glenelg is described. It is assigned to the eclogite facies by virture of its density, mineral composition, and associations. Its chemical composition is that of a picrite-basalt. Comparison with other garnet-pyroxene assemblages suggests that there are no clear differences between the partition of major and minor elements in these minerals at the eclogite and granulite facies of metamorphism. A diagram to represent parageneses in basic and ultrabasic rocks of the eclogite facies is presented, and points of interest discussed.

Eight nomenclatural problems connected with Mesozoic brachio-pods of the suborder Rhynchonelloidea are discussed and solutions suggested. A new genus is proposed related to Halorella and a new name is given to a species of Norella

A detailed account is given of the stratigraphical succession of the Chatwall Flags and Sandstone of the type area in South Shropshire, and a restricted use of the name “Chatwall Sandstone” is proposed.