Large amounts of wood and peat were found on a very low spring tide between the following grid references, between Penzance Harbour and the rocks at Chyandour.
Eastern Extent: SW4790630774 - SW4792330766
Western Extent: SW4786830743
The peat deposits are quite soft and spongy underfoot and they contail remains of trees. The organic remains may contain the bivalve molluscs Piddocks and even Shipworms. See - Peat Pebble 1 above.
If the sea has uncovered the material it can be seen on an extreme low tide by going down to the low tide mark and walking west when first stood in line with the right hand corner of the signal box east of Penzance Station.
The visible area is about 50m wide, and it appears it is an ancient tree lined lake bed. Trees that have been identified include Alder and Hazel.
For images of Piddocks and Shipworms see Marine Bivalves.