GLA 6: Croham Hurst

GLA 6: Croham Hurst, Recommended RIGS
London Borough of Croydon, TQ 338 632
Ownership: Local Authority. Open access, check with local borough for organised visits.

Small exposures of calcite cemented, rounded flint pebbles belonging to the Harwich Formation (Blackheath Beds) can be found at the top of this steep inlier (an area of older rocks surrounded by younger rocks). Evidence of Chalk and Thanet Formation can also be found in landslips and animal holes, eroded surfaces and fallen tree roots. The disused Chalk and Thanet Sand quarries are rather overgrown. Although the Lambeth Group should also be visible, it has been very elusive and it is possible that the Blackheath Beds are within a channel that has cut it out, at least for much of the hill.

There is an information board erected by Croydon Natural History and Scientific Society showing the location of the disused quarries and outcrops. A leaflet is also published by the Croydon Natural History Society1 with the same map but with the addition of a section1. The site is featured in GA Guide 68, pp. 141-142

1 Croydon Natural History Society leaflet is available from CNHSS, 96A Brighton Road, South Croydon, CR2 6AD (send SAE).

Exposure in woodland
Source: London’s foundations, page 133

GLA6

Site Map OS Topography © Crown Copyright
Source: London’s foundations, page 131

GLA6 map

 

 

 

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