trappose

From Thunder Mountain westward, trappose greenstone is the prevailing rock: it gives rise to some strange pilastered precipices near Fort William.

The Conquest of Canada (Vol. 1 of 2) George Warburton 1836

It is of difficult decomposition, being hard and adhe - sive, but faffing easily into trappose pieces.

Transactions of the American Philosophical Society 1771

The oldest red sandstone on the Connecticut river, when level, which it generally is, ought to produce a good soil where it is covered with ridges of greenstone trap; but a gradually thin soil, where the irregular declivities and trappose division of the rock, prevents the accumulation of earth sufficiently quick to form a permanent soil.

Transactions of the American Philosophical Society 1771

For instance; the hornblende rocks which cover the red sand - stone, are in many places so chrystalhne, as scarcely to be dis - tinguished in hand specimens from some of the hornblende rocks which alternate with the gneiss; it is the same with much of those small grained rocks of trappose forms, found in the primitive, compared with the transition trap or horn - blende rocks found in the transition; though the latter alter - nate with transition slate, or what is called roofing-slate, in which the remains of organic matter have been found.

Transactions of the American Philosophical Society 1771