interbedded with the Triassic sandstones are contemporaneous lava beds which were fed from dikes.
Followed along their outcrop such rocks sooner or later become mixed and interbedded with ordinary sedimentary matter.
The coal is found, as already described, interbedded with shales and sandstones.
Near Lithgow extensive deposits of limonite, or clay-band ore, are interbedded with coal.
In the Little Cumbrae they appear on the east side, where they underlie and are interbedded with the lavas.
The chief rocks of the Campbell Rand series are limestones and dolomites, with some interbedded quartzites.
Sheets of igneous rock are interbedded with the strata and many dikes of igneous rocks cut through the whole combination.