The keen amateur palaeontologist was astonished when he followed Poppy's nose to a 5’5” long skeleton fossil of an ichthyosaur, laid bare by the low tide.
Writes the Beeb, Gopsill said, "I had goosebumps when I saw it, I walked away and walked back and kept shaking my head in disbelief.
“It was just after the storms before Christmas and we were on a huge slab of rock - about half a mile out - and Sam was looking at something.
“It was about 5ft 5in (167cm) long and looked so fresh. I couldn't believe it, it was amazing.”
Calling in help
Gopsill was uncertain of his next move. He contacted South West Heritage Trust and was told that it would be extracted as soon as possible. The fossil was removed from the beach on the 27th December.
Scientists believe the Ichthyosaur may belong to a new species. However, without a head it is hard to be sure. The fossil is currently in the process of being removed from the stone in which it has been entombed for aeons.
Palaeontologist Dr Andy King told the BBC, “The next stage after that is to consolidate and harden the rock that [it] is in and it really is only at that last stage that we'll have an indication about what the species is and whether or not it is new.”
Once the fossil has been taken from the stone and inspected, it will be displayed at The Museum of Somerset. Gopsill hopes its current nickname, Poppy, will stick.