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Preexisting relief tends to be leveled-out and transformed into a flat morphology, or into a steplike one, if successive flows terminate at different distances from the erupting fissures. Clay-rich soils that form by weathering between eruptions, or sands, are sometimes found between successive sheets. The original continuity of basalt plateaus aquifers is often disrupted by deeply incised valleys cutting into underlying formations or by tectonic disruption, into fault blocks (Fig. 9a,b). Some volcanic plateaus are built up by ignimbrites—ashes erupted in an incandescent state and welded together by heat.

Rocks composed of calcite and dolomite, in varying proportions, are dolomitic limestones. Rocks built of the mineral magnesite (MgC0 ) are rare. Dolomites can be distinguished from limestones by the rougher surface they display when freshly broken and by the fact that they do not effervesce with hydrochloric acid. In the field, dolomite formations are often of a dull gray color and form characteristic landscape features. 3 3 3 2 2 Aquifer Type s and Groundwate r Environment s Only carbonate rock formations with a thickness of at least several tens of meters make potential aquifers.

Conclusions from such appraisals are representative of long-years average groundwater flow, provided that there is no significant abstraction upstream of the observed section. Where small rivers are coupled to small groundwater basins, problems stemming from intensive groundwater exploitation may become acute within a short time. At first, groundwater is usually exploited by private owners without regard to the hydrologic implications. Within a few years, the dry-weather flow of the river is seriously diminished, users dependent on river water suffer and start using groundwater, thus aggravating the effect.

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