Geological map (A) and lithostratigraphy (B) of the Sangiran area. In A, thick red arrows show the sections (S48, S49, D51, and S53A) sampled for paleomagnetic analysis. Crosses show H. erectus fossil sites: mandible Pithecanthropus b (Pb), calotte Pithecanthropus II (P II), calotte Pithecanthropus III (P III), calotte Pithecanthropus VI (P VI), calotte Pithecanthropus VII (P VII), and cranium Pithecanthropus VIII (P VIII).