Reports and Proceedings — Geological Society of London. 131 



quartz-veins ; in some parts of it the radiolaria are preserved in an 

 unusually perfect condition, showing their latticed structure and 

 spines very distinctly. The radiolaria for the most part are casts 

 only, without any definite bounding-walls, their outlines being 

 indicated by the dark material of the groundmass, while the interior 

 of the test has been infilled with clear silica, sometimes the crypto- 

 crystalline variety, at others fibrous chalcedony. In the forms 

 showing the structural details, these alone have been replaced by 

 the opaque substance, and are thus well defined against the clear 

 silica infilling the test. Eleven species are described, of which ten 

 are new, while one has been previously recognized in the cherts of 

 New South Wales. 



2. " Gravel at Moreton-in-the-Marsh (Gloucestershire)." By S. S. 

 Buckman, Esq., F.G.S. 



The author describes certain gravels of Triassic debris and flints 

 at Moreton-in-the-Marsh, with special reference to an upper bed 

 whei'ein the fragments are mostly in a vertical position, some of 

 them having their heavier ends uppermost. He theorizes that the 

 vertical materials were the droppings from melting ice floating 

 down a large river. This river, formed out of one or more of 

 original consequents of the Thames system, existed before the 

 valley of the Warwickshire Avon had been excavated. By one 

 branch, possibly the upper Trent, it drained the Pennine range ; by 

 another, possibly the upper Severn, the Welsh hills. Ice formed in 

 the upper waters — in these highlands — enclosing debris, and when 

 a thaw occurred, it floated down to the lower parts of the river. 

 The author notices certain flints obtained from the gravels. Those 

 from the upper bed are quite unabraded ; those from the lower bed 

 have their edges worn, and in some cases battered, while sometimes 

 they are peculiarly flaked as if artificially worked. The author 

 surmises that the date of the gravel, if formed by a river-system as 

 supposed, is Pliocene. 



3. " On the occurrence of Pebbles of Schorl-rock from the South- 

 West of England in the Drift-deposits of Southern and Eastern 

 England." By A. E. Salter, Esq,, B.Sc, F.G.S. 



A set of twelve representative specimens, consisting essentially of 

 quartz and tourmaline, have been looked over by Professor Bonney, 

 ■who informs the author that they consist mainly of felspathic grits, 

 schorl-rock, etc., similar rocks to which occur in the South-West 

 of England. The most westerly point at which the pebbles have 

 been detected is on Great and Little Haldon Hills, 800 feet above 

 Ordnance datum, where they are of larger size, more abundant, and 

 coarser-grained than elsewhere. Thence they are traced to the 

 north and south sides of the Thames Basin, and into East Anglia at 

 Walton-on-the-Naze, Aldeburgh, etc. There is a general decrease 

 in height in the deposits in which the pebbles occur, in passing from 

 west to east, and the pebbles appear to have taken two main courses 

 — one along a peneplain west to east from Dartmoor, the other from 

 south-west to north-east across England. The pebbles are absent 



