Figure 36. Stratigraphic columns showing formations adjacent to Cretaceous-Tertiary (K-T) interface at six localities in San Juan Basin (Figure 1) where palynologic data have precisely fixed its stratigraphic position. Interface is palynologically bracketed at all localities except San Juan River site. K-T interface coincident with base of Ojo Alamo Sandstone or Animas Formation except at Mesa Portales and possibly locally in Cuba area. Complete palynomorph lists in Appendix.