Figure 55. Palynologic correlation diagram based on core-hole data in the San Juan and Raton Basins; modified from Tschudy (1973, figure 5). Tick marks on drill-hole lines represent levels where core samples yielded identifiable palynomorphs. All of Maastrichtian stage appears to be missing in Gasbuggy 1 core. Hiatus at Cretaceous-Tertiary (K-T) interface is nearly 8 m.y. in the southern San Juan Basin; no hiatus in Raton Basin at the K-T boundary.