At the end of the last ice age, about 10,000 years ago, the region of the Palatine Forest was covered with tundra-like vegetation, amongst which, initially, undemanding tree species such as pine and birch were able to spread as the climate gradually warmed up (the "pine-birch" period). As climatic conditions improved these species were followed by hazel, oak and lime (the "hazel and oak period"). From the 3rd millennium a more Atlantic-influenced climate evolved, which was cooler and wetter, so that now beech characterised the forest scenery. The oak and beech mixed woods, typical of the current period, emerged, the pines being forced back into those areas that were either less favourable, very wet or very dry places, but remained part of the natural woodland.