The quarry, now a Dorset Wildlife Trust nature reserve, covers 12.2 hectares.
[3] Since being abandoned the area had been left to regenerate naturally, with the aid of scrub management.
[6] Within the quarry are relics of past industrial activities, including blocks of cut stone and a quarryman's shelter.
The quarry's rocky slopes, grassy pockets and sheltered gullies are all havens for wildlife, and therefore features a wide range of plants and animals, hosting flora and fauna specific to limestone soil.
[7] Described as one of Portland's prime nature habitats,[8] the thin limestone soils have been slowly colonised by a variety of wildflowers.