Theoretically the stuff is still edible – but we wouldn’t say it’s advisable’
A prehistoric 10 kg lump of butter was unearthed by Jack Conway in Ireland. The finding has been given to the National Museum, where it will be preserved. Andy Halpin, assistant keeper in the museum’s Irish Antiquities Division, said that the finding isn’t extremely rare, as ‘bog butter’ was actually quite common back in the day.
Until 2003, scientists and archaeologists were not quite sure of the origin of bog butter, but Bristol researchers discovered that some samples of the “butter” were dairy products, while others were animal fat. Preserving butter and fat was difficult without a fridge, so people often went to strange lengths to preserve it. In Great Britain and Ireland especially, people used to put the products in wooden boxes or animal hides and bury them in peat or bogs, where the temperature was cooler.
continue http://www.zmescience.com/science/news-science/bog-butter-ireland-14062016/
absenteereality 
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