Marine reptile bone in large rock

Scientific name: Indeterminate marine reptile, possibly a plesiosaur.

Geological formation: Conway Formation?

Age: 83 to 65 million years.

Location: Mikonui Stream mouth, Oaro, South Island, New Zealand.

Size: Actual bone piece measures 4-5 centimeters long, measures 3-4 centimeters wide.

This is a piece of marine reptile bone (possibly a fragment of plesiosaur jawbone) that me and Logan (Moahunt1) found at Mikonui Stream. The same rock has a couple of other pieces of bone and lots of shark teeth as well.