Hello Indy (If you're going to go by the late 20th century's greatest fictional archeologist, then I get to call you by his nickname
) and thanks for the response... I was hesitant to attribute it to the Solomon Islands with any degree of certainty, given the (general) form seems to occur elsewhere in the South Pacific.
The more time I am spending with this club, the more I am warming to it...
What appear as crescents when viewed head-on take on the appearance of open, teeth-lined mouths when viewed horizontally from the edge: