Figure 2. The Chilga section including the upper sedimentary strata and underlying weathered basalt modified from Kappelman et al. (2003). The Ages to the immediate right of the Geomagnetic Polarity Time Scale panel are in Myr. V, vertebrate localities. VGP, virtual geomagnetic pole. White circles, paleomagnetic samples; black circles, site polarity means. Black bars, normal polarity; white bars, reversed polarity. Arrows refer to minor variations in the paleomagnetic record (Cande and Kent, 1995).