The Blue Jar of Yblesh is one of the more famous supposed examples of an out-of-place artifact or OOPArt. Excavated near Yblesh by Sir Roger Stanley in 1894, the Blue Jar appears to be a simple cobalt class container, shattered and then reassembled with a lid. It was found in a strata indicating that it had been buried in approximately 2500 BCE.

However, the Jar appears to have been made using the Schürer process, which was invented in Europe around 1400, and it is in a style more akin to the late 1600s or early 1700s. The presence of an early modern glass in an early modern style continues to excite speculation. Time travel enthusiasts, young-earth creationists, and even alien abductees have all cited the Blue Jar of Yblesh as proof of their views.

Naturally there are skeptics, most of whom claim that the Jar was either planted by Sir Roger or accidentally mixed in with an improper strata during an excavation that left much to be desired by modern standards. Carbon dating does not work on glass, and detailed studies on the Jar have been limited to its current owner, the Vatican Museums, which is reluctant to potentially damage an item popular with tourists.

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