The site contains two types of mire, a valley mire and a soligenous mire, the former a scarce habitat in County Durham.
2.
On the quarry floor, natural seepage has given rise to areas of open water, which grade into a variety of soligenous mire and fen vegetation types.
3.
The soligenous mire is characterised by sharp-flowered rush, " Juncus acutiflorus ", and purple moor-grass, " Molinia caerulea ".
4.
A short distance to the south, the smaller parcel supports a base and nutrient-rich soligenous fen-type vegetation in which the dominant species varies between purple moor-grass, " Molinia caerulea ", and meadowsweet, " Filipendula ulmaria ".
5.
The area adjacent to Hisehope Burn is predominantly a soligenous Carex spp " and bryophytes and contains several species that are localised in County Durham, including few-flowered spike rush, " Eleocharis quinqueflora ", grass-of-Parnassus, " Parnassia palustris ", sundew, " Drosera rotundifolia ", and lesser clubmoss, " Selaginella selaginoides ".
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