Such masses are termed trappean agglomerate and trappean breccia.
We first crossed more hills of the trappean conglomerate on which grew ironbark eucalypti and box.
What is the difference between trappean breccia and trappean conglomerate?
They never repose on the volcanic or trappean formations, nor on strata containing organic remains.
The igneous rocks will be described under the various groups of Granitic, trappean, and Volcanic.
In its course it affords a good exemplification of the passage from the trappean into the plutonic, or highly crystalline texture.
We this day crossed several fine running streams and forests of box and bluegum growing on ridges of trappean conglomerate.
If there be any difference of date, it would seem that the fine-grained granite must be newer than the trappean rocks.