In the later Paleogene (34 to 23.8 million years ago) and Neogene (23.8 to 2.8 million years ago) and also in the Quaternary period (2.8 - 0.01 million years ago) erosion processes once more dominated. In particular, it was the weathering and removal processes that occurred during the various cold and warm periods that determined the final topographical shape of the Palatinate Forest. Characteristic of this is a system of deeply incised valleys, especially in the north and centre, diverse mountain shapes and bizarre rock formations.