Thanks guys,   I felt very lucky to find this bit. I'm a bit sore today. I'm used to walking a lot but not flipping boulders. The rock here is also very hard so trimming is hard work.   Just measured the vert and its 16 cm or 6.3 inches in diameter. I would love to find the other half!   Its been a dream of mine to find Meg material at this site and this could be it. Only other candidates could be Basking Shark (Cetorhinus maximus) or Whale Shark (Rhincodon typus).