38 
VOLCANIC PRODUCTS 
ISOOK I 
calated in the same sedimentary series with wliich they are associated. 
Or it may contain large bombs and slags, such as most probably came either 
directly from explosions or from the washing down of cinder-cones or other 
contemporaneoxisly existing volcanic heaps. Examples of such intercalated 
conglomerates will be given from the Lower Old Tted Sandstone of Central 
Scotland and from the Tertiary volcanic plateaux of the Inner Hebrides. 
