High Quality Content by WIKIPEDIA articles! Prenocephale was a small pachycephalosaurid dinosaur genus from the Late Cretaceous (from the Campanian through to the Maastrichtian) and was similar in many ways to its close relative, Homalocephale, which may simply represent Prenocephale juveniles. Adult Prenocephale probably weighed around 130 kilograms (290 lb) and measured around 2.4 metres (8 ft) long. Unlike the flattened wedge-shaped skull of Homalocephale (a possible juvenile trait also potentially seen in early growth stages of Pachycephalosaurus), the head of Prenocephale was rounded and sloping. The dome had a row of small, bony spikes and bumps. It lived in what is now Mongolia; but in high upland forests, not the dry deserts of Mongolia today.