See cache CSW1 for details of this series.
The Kyd Brook is the bigger of the two streams that flow through the woods. The Kyd Brook is known as the river Quaggy in its lower reaches, which itself is a tributary of the river Ravensbourne which flows into the river Thames at Deptford.
If you look into the stream you can see the rounded pebbles of the Blackheath Beds. The Blackheath Pebble Beds consist of sand and pebbles that were formed about 55 million years ago when much of north Kent and southern Essex was submerged under a shallow sea or lagoon. Over the next 15 million years this area mainly remained under the sea, being buried by perhaps about 200 metres of sediment, including the London Clay which today creates this rare wet woodland habitat that supports a wide range of plants, wild animals and birds, as well as butterflies and moths.
The footpath is used regularly by walkers, joggers, dog walkers and dogs, so stealth is required in finding this cache.
Permission for cache placement in the SSSI has been obtained from Natural England and the Senior Ranger and Site manager.