Bituminous coal, with finely divided laminæ, associated with brown crystalline limestone, with cherty beds, and grey-yellowish sandstone, passing into brownish-red sandstone.

Few large trees were seen on these eminences, which were often bare, with a hard cherty footing, replaced sometimes by clusters of brambles and thickets.

The arenacious and cherty varieties frequently occur in the same bed; sometimes they form distinct beds.