Telling someone where you found
Mark weighed the idea of reaching out to someone who was more knowledgeable. An expert or historian could shed light on the strange artifact. He knew the potential repercussions of a public disclosure. Professionals may investigate the object if they believe it to be important.
Not only would it require careful removal and analysis of the object, but also an extensive exploration of his backyard that could upset the balance of the garden. He weighed up the risks and the benefits of turning his home into an archaeological dig.
