Under det frugtbare ler ligger der et vandgennemtrængeligt kalklag. Romerne brugte denne kalk (som man kalder mergel på de vulgære dialekter) allerede i deres bygninger. Også ved opførelsen af mange kirker i Haspengouw, herunder basilikaen i Tongeren, var de Herse kalksten meget nyttige. Mellem 1930 og 1960 dyrkede man millioner af champignon i disse tidligere mergelgrave. Nu udgør disse huler (også kaldet mergelgruber) et af de vigtigste overvintringssteder for flagermus i Vesteuropa.
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Wandelen in Limburg
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