On some Sections of Lincolnshire Neocomian. 371 



accumulated by sea- currents. The author then describes several 

 large areas in North Wales in which he could find no trace of 

 rounded gravel, enters into a consideration of the causes of these 

 driftless areas, and discusses the relative merits of the theory of 

 their having been temporarily occupied by land-ice, and of the 

 theory of non-exposure to tempestuous seas, or seas capable of 

 rounding stones. He then gives an account of the discovery of 

 granite boulders, associated with partially rounded drift, on the 

 summit of Moel Wnion, 1900 feet above the sea (near Aber, North 

 Wales) ; and endeavours to show that, while they could have been 

 readily transported by floating ice (probably from Scotland, certainly 

 not from Cumberland), the flow of land-ice from Snowdon, ac- 

 cording to Eamsay, along the north face of Moel Wnion, must have 

 prevented the access of northern land-ice to the summit of 

 the latter mountain, while land-ice flowing from Cumberland to 

 Anglesey (according to Eamsay) could not have been crossed by 

 land-ice flowing south from Scotland to Moel Wnion. After re- 

 ferring to the outward direction of striae on the north coast of North 

 Wales, he concludes by giving a summary of facts and inferences. 



2. " On some Sections of Lincolnshire Neocomian." By H. Keeping, 

 Esq., of the Woodwardian Museum, Cambridge. 



The construction of the Louth and Lincoln railway, in the year 

 1872, led to the exposure of some fine sections of the Neocomian 

 strata forming the base of the Lincolnshire Wold. Erom these beds 

 the author had obtained a very large number of. fossils, in mam- 

 cases in an excellent state of preservation. As the 'sections are now 

 becoming obscure, the author gives an account of the observations 

 made by him at the time when they were best exposed, with lists 

 of the fossils he obtained from them. He agrees with Professor 

 Judd, who in 1867 first described these strata and determined their 

 age, in his conclusions concerning the classification and correlation 

 of the beds, but is disposed to regard the sands above Market Easen 

 as being a drift deposit, and not as belonging to the Lower Sand 

 and Sandstone. 



3. " Notes on the Geology of the Cheviot Hills (English side)." 

 By C. T. dough, Esq., M.A., F.G.S. 



After a brief description of the physical structure of the district, 

 the author passes on to its igneous rocks. These he groups under 

 three heads — (1) the granite, (2) the lava-flows and ash beds, (3) 

 the intrusive dykes. The first occupies an area of about 24 square 

 miles, it varies much in texture, is generally not conspicuously rich 

 in quartz, and often contains hornblende as well as mica. It exhibits 

 in places a curious streaked or banded structure due to local crush- 

 ing. This is fully described. The lava-flows (with ashes) are por- 

 phyrite ; this is generally compact, sometimes glassy in structure, 

 with scattered crystals of plagioclase, biotite, hornblende (sometimes 

 augite), a little free quartz, and occasional olivine and apatite. 

 Some peculiarities in these rocks are described. The intrusive dykes 



