Rocks and Minerals of British Guiana. 41 



NO. DESCRIPTION. LOCALITY. 



8 Hydro-oxide of iron and clay Siparuni river. 



9 ,, „ ,, Rupununi river. 



10 Quartz sand cemented by 



oxide of iron Quitaro river. 



1 1 „ „ „ Demerara river. 



12 ,1 ,, „ Anourime inlet, Rupununi 



river. 

 13-14 Hydro-oxide of iron ... Supinaam river. 



15 „ ,, ... Woka mountain, Cuyuni 



river. 



16 Sand cemented by oxide of 



iron ... ... Quitaro river. 



17 Oxide of Manganese ... Between Barima and Barama 



river. 



18 Hydro-oxide of iron ... Wahmara mountain,Uppsr 



Demerara river. 



19 Pisolitic hydro-oxide of iron „ ,, 



20 Sand and oxide of iron ... „ „ 



21 Sand cemented by oxide of 



iron ... ... Etunie, Berbice river. 



22 Recent conglomerate ... Upper Demerara river. 



23 Ironstone pebble, with pol- 



ished coating ... ., „ 



24 White clay (Kaolin) ... Wickie, Berbice river. 



25 ,1 stained by oxide 



of iron ... ... „ „ 



26-27 White clay (Kaolin) ... Oreala, Corentyne river. 



28 Sand cemented by white clay „ „ 



29 „ impregnated with black 



vegetable matter ... Siparuta, „ 



30 Coarse angular pebble in 



clay ... ... „ „ 



31 Salt earth ... ... Chewow river, Ireng savannah. 



II.— SANDSTONE FORMATION. 



32 Argillaceous sandstone ... Karakanang, Pacaraima moun- 



tains. 

 23 Sandstone , .. ... Yacali river. 



F 



