A few examples of sub fossils from local deposits that attract a magnet.
This Equus Skull easily attracted a small round rare earth magnet.
The two images below show me scraping the inside of a freshly cut bone after I had thoroughly cleaned it to remove any residual metal from the saw blade, I used a hard plastic scraper the inner bone material was found to be highly magnetic.
https://www.youtube.com/watch?v=w5-hQA9P8qg
This Equus Skull easily attracted a small round rare earth magnet.
As did the bones below found and excavated about 3 miles away in fact the first pic show week kids magnets sticking.
The two images below show me scraping the inside of a freshly cut bone after I had thoroughly cleaned it to remove any residual metal from the saw blade, I used a hard plastic scraper the inner bone material was found to be highly magnetic.
The video below shows an experiment I carried out with an antler piece.