Similar(?) bore marks/holes can be found in rocks and shells caused by water and/or sand (worn by circular eddies). That doesn't mean the holes in your wood weren't caused by scary worms though.
This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.