[1][2] The caverns and passages were formed in the early Pleistocene period in Devonian limestone[3] by water action and have been occupied by one of at least eight separate, discontinuous native populations to have inhabited the British Isles.

[4] The other key paleolithic sites in the UK are Happisburgh, Pakefield, Boxgrove, Swanscombe, Pontnewydd, Paviland, Creswell Crags and Gough's Cave.

[9] Northmore's work attracted the attention of William Buckland, the first Reader in Geology at the University of Oxford, who sent a party including John MacEnery to explore the caves in an attempt to find evidence that Mithras was once worshipped in the area.

[9][10] When MacEnery reported to the British Association the discovery of flint tools below the stalagmites on the cave floor, his work was derided as contrary to Bishop James Ussher's Biblical chronology dating the Creation to 4004 BC.

[13] Pengelly plotted the position of every bone, flint, and other artefact he discovered during the excavations and afterward continued working with the Torquay Natural History Society until his death in 1892 at his home less than 2 km from the caves.

[14] In 1903, Kents Cavern, then part of Lord Haldon's estate, was sold to Francis Powe, a carpenter who originally used the caves as a workshop while making beach huts for the Torquay sea front.