Centrally, Precambrian, Cambrian, Ordovician, Carboniferous and Permian predominate. The Highveld is mostly Karoo Sequence sedimentary rock of a younger, Carboniferous to Permian age. It overlies a thick sequence of Carboniferous Limestone beds. They flourished particularly during the Carboniferous and Permian periods. The Peak is formed almost exclusively from sedimentary rocks dating from the Carboniferous period. The Permian began with the Carboniferous flora still flourishing. County Durham is underlain by Carboniferous rocks in the west. These gneisses were penetrated by a number of granitic bodies during the Carboniferous period. Puffin Island is made of carboniferous limestone. Ophiacodontidae is an extinct family of early eupelycosaurs from the Carboniferous and Permian. The earliest known Lagenid fossils appear during the Moscovian epoch of the Carboniferous. This has been confirmed by fossilized footprints found in Carboniferous rocks. All three groups are known from the Late Carboniferous and Early Permian. The first amniotes apparently arose in the Pennsylvanian subperiod of the Carboniferous. Significantly more abundant are deposits of the Carboniferous and Jurassic periods.