290 THE UITENHAGE SERIES 



Sunday's River beds . Clays, shales and sandy limestones with 



marine fossils. 

 Wood beds . . . Yellow sands, shales and limestones with 



a few marine shells and numerous 



plants. 

 Enon beds . . . Sandstones, marls and conglomerates. 



THE ENON BEDS. 



The Enon beds are found at the base of the series 

 throughout the district, but the thickness and nature of 

 the rocks differ very much within rather short distances. 

 In the upper part of the Zwartkops Kiver the Enon 

 beds attain a very considerable thickness, as is also the 

 case near Enon ; but near Blue Cliff Station the con- 

 glomerate lying between the sandy and argillaceous 

 rocks of the Uitenhage series, and the surface of the 

 older rocks below, the Bokkeveld beds in this case, is at 

 most only a few feet thick, and at places it is entirely 

 absent. 



The Enon beds are here taken to include the Zwart- 

 kops sandstone and variegated marls of Atherstone's 

 classification, 1 for the conglomerates are so intimately 

 connected with rocks agreeing with Atherstone's de- 

 scription of these two subdivisions that it is convenient 

 to group the three together. There is indeed much 

 reason to believe that the three subdivisions of the 

 Uitenhage series are to be regarded more as three kinds 

 of deposit formed under different circumstances, but 

 at about the same time, than as successive groups of 

 deposits. In any one spot, such for example as Wolve 



1 Atherstone, " The Geology of Uitenhage," Eastern Province Monthly 

 Magazine, vol. i., pp. 518, 580, Grahamstown, 1857. 



