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Soon the slag-like mountains were passed and the country began to spread, first in a high barren land, then with a bottom land running back from the river. The willow bushes changed to willow trees, tall and spindly, crowded in a thicket down to the river's edge. The Chemehuevi Indians have their reservation here.
As the lava crept down the gentle slopes of the valley, it crusted over, forming a black, slag-like surface. The surface was from time to time broken up and mixed with the softer portions beneath, so that the movement of the flow was still further retarded.
The mountain, throughout its height of over one thousand feet, is a conical aggregate of loose lapilli which give way under the feet and make climbing the peak very tiresome. The lapilli and scoriæ are slag-like fragments of lava which have been blown out of the throat of the volcano while in a hot or semi-molten condition.
They stand dark and cold, giving no clue to the nature of the forces which made them, except perhaps by the presence of an occasional hot spring and the appearance of the rocks of which they are composed. The slag-like character of these rocks we have learned to associate with intense heat.
On every side of them rose the scaly, conical hills with their loose, slag-like debris, and jagged-edged khors, with sinuous streams of sand running like water-courses down their centre. The camels followed each other, twisting in and out among the boulders, and scrambling with their adhesive, spongy feet over places which would have been impossible for horses.
They are not arranged in regular layers like sandstone and shale; many of them show numerous little cavities which once contained steam. These cavities give to the rock a slag-like appearance. In this kind of rock, which we shall call lava, there are, of course, no remains of shells or bones of animals such as are often found in rocks formed from sand or clay.
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