"It's rare to find a barrel as intact as that," Mr. Clancy explained, "especially with the lid intact, and attached. It's a really fine example."
He estimates that the barrel is approximately 3,000 years old, from the Iron Age.
At the moment it is being dried out by staff at the Conservation Department. Once dry it will be soaked in a wax-like solution which preserves it.
"At 35ks, it's a pretty big one," Ms. Smith explained. Other examples of bog butter they showed tended to be less intact and much smaller.
http://www.discoveryon.info/2009/08/3000-year-old-butter-found-in-kildare.html -via Unique Daily