Igneous Rocks.

I have already alluded to the diabasic beds and their ashes, which are interstratified in many horizons between the strata of purely sedimentary origin; besides them, are a few dykes of hyperite, which might have been injected when the huge foldings were formed. In one instance, in Coal Creek, Rangitata, I found a bed of melaphyre, somewhat amygdaloidal, interbedded between two strata of sandstone, but it had probably been forced between them at a much later date, belonging to the formation next to be considered.