many years back now I picked up some offcuts from where they were replacing the groins, apart from being very waterlogged the timber was nasty if you got a splinter, the wound would fester within hours. now over 20 years later the timber is still as sound as the day I got it, despite being out in the weather ever since, and being used in places as a raised bed. I cant recall the timber (possibly greenheart) but it is a sustained forest wood, but atrocious to work.
Grendel