STRATIGRAPHY. 35 



character of the deposit. In the lower Vindyhan area, where lime- 

 stones are abundant, the calcareous concretions are especially abun- 

 dant. In the transition area such are rarer and ferruginous concre- 

 tions are as common, and in places more abundant than, calcareous, 

 while in the Gondwana area, where limestone is wanting and iron 

 oxide common, the concretions are principally ferruginous. So also 

 it was noticed that in and near the outcrops of the red shale series 

 the fine-grained surface deposits had usually a distinctly reddish 

 tinge, while away from them the colour was usually a pale grey, 

 sometimes ranging to dark grey or nearly black. 



D 2 



( 3* ) 



