182 
(3) The third group of sections was from the Basalt 
and the underlying rock exposed above the village of 
Castleton. The minerals contained in the Basalt are 
Olivine, Magnetite and Felspar. Traces of fossils can be 
found in the rock between the unaltered Limestone and the 
Basalt, but hydrochloric acid does not affect it. 
