pot-hole

On its southern side the bottom of the doline is home to a pot-hole whose entrance, large, almost circular and 7 metres (22 feet) in diameter, has vertical walls that plunge down to a ledge 17 metres  (56 feet) below. The cavity continues, twisting and turning, reaching a maximum depth of 39.5 metres (130 feet).The presence of this pot-hole serves to increase the thermal inversion phenomenon as it represents further trap of cold, moist air within the doline itself.

The development of vegetation in these cavities follows the gradient of temperature, light and humidity. So at the pot-hole mouth shade-loving flowering plants characteristic of the shady undergrowth of the dolines. Below this range follow the ferns such as the Hart's-tongue Fern (Phyllitis scolopendrium). Further down still are the mosses including the abundant Thamnium alopecurum, while below this, deeper still, we find a patina of green and blue-green algae.

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