The first building of Stonehenge measured about 115 m in diameter and consisted of a circular wall with a ditch as edging, typological terms, therefore an atypical Henge complex. It stood in the northeast and a smaller one in the south, deer and cattle bones were placed at the bottom of the trench. These bones were considerably older than the antler picks, with which the trench was dug, and were well received when they were buried. This first phase is dated to around 3100 BC. The outer circumference of a circle was thus framed area from 56 holes. These Aubrey holes, named after its discoverer, John Aubrey, a historian of the 17th Century, may have once contained a wooden pillar. A smaller outer wall that surrounded the ditch could also date from this period.