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Crystal Mountain, Mul rooney knew why.
He had started by circling the entire mountain and had discovered that there was effectively a gap between the seaward flank and the rest of the chain. This set the Crystal Mountain eastward of the main chain, standing on its own. Because it was lower than the highest peaks to seaward, it was invisible from the other side. Nor was it particularly noticeable in any other way, except that it had more streams running off it per mile of hillside than ran off the other hills, to north and south.
Mulrooney counted them all, both on the Crystal Mountain and on its companions. There was no doubt of it. The water ran off the other mountains after rain, but a lot of water was soaked up in the soil. The other mountains had twenty feet of topsoil over the basic rock structure beneath, the Crystal Mountain hardly any. He had his native workers, locally recruited
Vindu, bore a series of holes with the augur he had with him, and confirmed the difference in depth of the topsoil in twenty places. From these he would work out why.
Over millions of years the earth had been formed by the decomposition of the rock and by dust carried on the wind, and although each rainfall had eroded some of it down the slopes into the streams, and from the streams to the rivers and thence to the shallow, silted estuary, some earth had also remained, lodged in little crannies, left alone by the running water, which had bored its own holes in the soft rock. And these holes had become drains, so that part of the rainfall ran off the mountain, finding its own channels and wearing them deeper and deeper, and some had sunk into the mountain, both having the effect of leaving part of the topsoil intact. Thus the earth layer had built up and up, a little thicker each century or millennium. The birds and the wind had brought seeds, which had found the niches of earth and flourished there, their roots contributing to the process of retaining the earth on the hill slopes. When Mulrooney saw the hills, there was enough rich earth to sustain mighty trees and tangled vines which covered the slopes and the summits of all the hills. All except one.
On this one the water could not burrow channels that became streams, nor could it sink into the rock face, especially on the steepest face, which was to the east, toward the hinterland. Here the earth had collected in pockets, and the pockets had produced clumps of bush, grass, and fern. From niche to niche the vegetation had reached out to itself, linking vines and tendrils in a thin screen across bare patches of rock regularly washed clean by the falling water of the rain season. It was these patches of glistening wet amid the green that the missionary had seen before he died. The reason for the change was simple: the separate hill was of a different rock from the main range, an ancient rock, hard as granite as compared to the soft, more recent rock of the main chain of hills.
Mulrooney had completed his circuit of the mountain and established this beyond a doubt. It took him a fortnight to do it and to establish that no less than seventy streams ran off the Crystal Mountain. Most of them joined up into three main streams that flowed away eastward out of the foothills into the deeper valley. He noticed something else. Along the banks of the streams that came off this mountain, the soil color and the vegetation were different. Some plants appeared unaffected; others were stunted or nonexistent, although they flourished on the other mountains and beside the other streams.
Mulrooney set about charting the seventy streams, drawing his map as he went. He also took samples of the sand and gravel along the beds of the streams, starting with the surface gravel, then working down to bedrock.
In each case he took two buckets full of gravel, poured them out onto a tarpaulin, and coned and quartered. This is a process of sample-taking. He piled the gravel into a cone, then quartered it with a shovel blade,