1 40 Professor J ameson on Secondary Greenstone and W ache. 
crystallized character, as is observed in the bed nearest the 
greenstone. Such, then, are the appearances observable in 
the first or upper bed of greenstone, and the subjacent and 
superincumbent strata. 
W e shall next describe the second or lower hed of greenstone. It 
is about two feet thick, is perfectly parallel with the strata in every 
part of the section, and agrees in its imbedded minerals, veins 
and general aspect, with the greenstone of the upper bed. On the 
north-east side of the quarry this bed of greenstone terminates, 
and in this line of direction we have strata of slate-clay and sand- 
stone, as represented in Fig. S. Plate III., in which a a are the 
clay and sandstone. Resting immediately upon it there is a 
bed of pure quartzy sandstone, Fig. 2., more highly cry- 
stallized tlian that which occurs above the upper bed. It is two 
feet eight inches thick, but does not continue of the same thick- 
ness throughout. It contains imbedded cotemporaneous masses 
of slate-clay and clayey marl, and particles of galena. The slate 
and marl are not in the least affected by the highly crystallized 
sandstone in which they are contained. The clay is equally soft 
with the varieties found at a distance from the greenstone and 
in softer sandstones. Above this sandstone rests a bed of slate- 
clay, j!^ Fig. 2., not in the least affected by the highly crystal- 
lized sandstone. Resting on this bed are two beds of quartzy 
sandstone, g and Fig. 2., and one of red and green clay, 
i. Fig. 2., which meet with the layers already described as 
occurring below the first or upper bed of greenstone. This 
sandstone in the slate-clay is often as highly crystallized as 
that resting immediately upon the greenstone. The greenstone 
rests on alternations of beds of quartzy sandstone and slate-clay, 
Fig. 2., which continue to the bottom of the quarry. 
In this quarry the most interesting geognostical facts are the 
following : 
1. The perfect parallelism of the beds of greenstone, slate- 
clay, wacke, and sandstone. 
2. Beds of pure quartzy sandstone, of the same nature with that 
resting immediately on the greenstone, alternating with slate-clay. 
3. Layers of slate-clay between the most highly crystallized 
sandstone and tlie greenstone. 
