^,one-Rocks of 1. of Man. 171 



Man. It has been referred to the Old Red Sandstone, the Calci- 

 ferous Sandstone, the basement Carboniferous, and to the Permian. 

 The series consists of red sandstones containing irregular conglo- 

 merates and breccias, more or less chemically altered, known in the 

 Lake District as ' Brockram.' Sections at Ballagnane, Creg Malin, 

 and at the Gob and Traie Eogog, are described in detail ; the 

 rocks are classified, and their range to the north-east and inland 

 is described. It is pointed out that the rocks are different in many 

 respects from the basement Carboniferous rocks of Langness and 

 elsewhere, and a list of the materials contained in the ' Brockrams ' 

 is given. All these materials have been derived from rocks similar 

 to those which form the Lower Carboniferous Series in the Lake 

 District, with the exception of one or two types which might belong 

 to any other pebble-beach. The fossiliferous pebbles in the rocks 

 in question are described, and their fossil contents determined. The 

 whole group of fossils is Lower Carboniferous and Ordovician, and 

 centres mainly in the Carboniferous Limestone. A comparison is 

 instituted with the Permian rocks of Barrowmouth, the Vale of 

 Eden, and elsewhere. The rocks are much sheared and faulted ; 

 the planes of shearing intersect the bedding-planes, and divide the 

 rock into lenticular and diamond-shaped masses, which are scored 

 and slickensided. The earth-movement to which this is due took 

 place in the interval between the latest Palaeozoic and earliest 

 Mesozoic deposits. The iron in the rocks was probably derived 

 from the destruction of the Carboniferous shales. 



2. ' The Carboniferous, Permian, and Triassic Hocks under the 

 Glacial Drift in the North of the Isle of Man.' By William Boyd 

 Dawkins, M.A., D.Sc, F.R.S., E.G.S., Professor of Geology in Owens 

 College (Victoria University), Manchester. 



The whole of the Isle of Man, north of a line drawn due west from 

 Pamsey, is covered with a thick mantle of Glacial Drift. South of 

 this line rises the ice-worn Ordovician massif. Six borings carried 

 out under the advice of the author have elucidated the geological 

 structure of the Drift-covered area. The borings at Lhen Moar, 

 Ballawhane, Knock- e-Doony, Ballaghenny, and two at the Point of 

 Ayre are described in detail, and the rocks classified. The first 

 shows Carboniferous Limestone under Drift ; the second and third, 

 Trias, Permian, Yoredale, and Carboniferous Limestone : the fourth. 

 Trias, Permian (thin), and Yoredale : the fifth and sixth, Trias, with 

 gypsum and 76 feet of rock-salt. The rocks all dip in natural order 

 towards the north, and constitute a plateau of marine erosion sloping 

 to the north and east covered with Drift, which is in places not less 

 than 450 feet thick. 



3. ' Note on a Preliminary Examination of the Ash that fell on 

 Barbados, after the Eruption at St. Vincent (West Indies).' By 

 John Smith Flett, M.A., D.Sc, E.R.S.E., F.G.S. With an Analysis 

 of the Dust by William Tollard, M.A., D.Sc, F.G.S. 



Two samples of the material were sent by Dr. D. Morris, of the 

 Imperial Agricultural Department for the West Indies, to riot. J. 

 W. Judd, who forwarded them to the Director of the Museum of 



