310 



REPORT 1879. 



The rocks lying next to the trap were also analysed and gave results as stated 

 below : — 



1. Soluble in Hydric Chloride (HOI). 



2. Matter insoluble in Hydric Chloride (HC1), fused with flux and treated with 



Acid. 



The nodule when broken consisted of 



1. An outer coating of hard rock ; 



2. An inner lining of calcite crystals ; and 



3. Centre nodule of bituminous matter. 



When first brought to light, the calcite crystals were almost black in colour, 

 due to a certain amount of the bituminous matter ; but this slowly evaporated, and 

 left the crystals pure white in colour. The analysis of these crystals of calcite 

 yielded the following results : — 



