158 Mineralogy and Geology of a part of Nova Scotia. 
material to ban ore, which may be worked in this section of 
the provine 
our inilés southeast of this place a very important and 
extensive bed of 1 iron ore exists, in the clay slate of the South 
St. Mary’s cos where it approximates to the tra 
rocks, and is connected with them by Digby feta hich 
is composed of sandstone, as observed in the first part of 
this article. fe this reais! see the map.* This roel pre- 
had emerged from the central regions of the earth. 
That this rok is older than the trap rocks we have addition- 
al, and almost decisive evidence, derived from another source, 
which we shall state by and by, when our observations are 
directed more particularly to the iron ore bed which we 
have no hesitation in saying is co-extensive = the whole 
formatio 
: sapien is +6 a trad into in rhomboidal sb ayenta oa as 
it has natural seams both in the direction of, and at right 
angles with its stratification. This renders it a valuable build- 
‘material as it forms convenient shapes for rearing walle 
* In Vol. XIV. 
