The "science" field known as OOPARTS, or "Out Of Place ARTifactS" is a lively area of study with numerous examples. This paper will examine the most popular and least understood specimen, the Coso Artifact. It could be more than 500.000 years old. The outer layer of the specimen was encrusted with fossil shells and their fragments, with two nonmagnetic metallic metal objects in the crust. Stranger still, the inner layer was hexagonal and seemed to form a casing around the hard porcelain cylinde, containing a layer of decomposing copper. What is this strange articfact??