Modern archaeologists have found no trace of human remains among the sacrificial detritus, but recent discoveries at the mountain-top ash-heap altar that Pausanias saw but was reluctant to pry into, reveal that it was much older than the Classical Greeks themselves realised. Early 20th century excavations at the site had revealed nothing earlier than ca. 700 BCE, but the Greek-American interdisciplinary Mt. Lykaion Excavation and Survey Project excavated a trench and detected ritual presence at the site at the beginning of the third millennium BCE, a thousand years before Zeus was worshiped in Greece. A Late Minoan rock crystal seal bearing the image of a bull was a notable surprise.