Graigwen
Active member
This is only about 1000m from my home.
Kent Live link
It is certainly a large collapse, but not a sinkhole. It is on unpromising geology of Eocene sediments near the boundary of the Harwich Formation and Lambeth group. The site used to be part of the grounds of a large house called Marten's Grove, so some buried trace of human activity is possible. I think a small tributary of the River Cray once flowed near here and left some fluvial sands behind. A nearby house, long demolished, did once have an ornamental water feature. Old maps offer no obvious explanation. This area of heathland did have a tradition in the nineteenth century of extremely deep well digging as the water table is a long way down. At the moment the most likely explanation is probably washout from drain or water mains failure.
I asked some locals whether they thought this could be part of a cave system larger than Ogof Draenen. Their replies were:
"Could be."
"It is huge."
"I dunno."
"What is a Dry Nan?"
.
Kent Live link
It is certainly a large collapse, but not a sinkhole. It is on unpromising geology of Eocene sediments near the boundary of the Harwich Formation and Lambeth group. The site used to be part of the grounds of a large house called Marten's Grove, so some buried trace of human activity is possible. I think a small tributary of the River Cray once flowed near here and left some fluvial sands behind. A nearby house, long demolished, did once have an ornamental water feature. Old maps offer no obvious explanation. This area of heathland did have a tradition in the nineteenth century of extremely deep well digging as the water table is a long way down. At the moment the most likely explanation is probably washout from drain or water mains failure.
I asked some locals whether they thought this could be part of a cave system larger than Ogof Draenen. Their replies were:
"Could be."
"It is huge."
"I dunno."
"What is a Dry Nan?"
.