Fig. 1 in Short-term survival of ammonites in New Jersey after the end-Cretaceous bolide impact

Fig. 1. Stratigraphic section in the Manasquan River Basin, Monmouth County, New Jersey. A. The top of the Tinton Formation consists of the Pinna Layer overlain by the Burrowed Unit, which is overlain, in turn, by the Hornerstown Formation. An enriched concentration of iridium occurs at the base of the Pinna Layer (indicated by the stars). The position of the Cretaceous/Paleogene boundary in this figure is based on the assumption that the enriched concentration of iridium is in place. B. Iridium profile from two sites (represented by the solid and dashed lines) in the Manasquan River Basin (Landman et al. 2007a). C. Map of part of New Jersey showing localities mentioned in the text: 1, Manasquan River Basin; 2, Buck's Pit; 3, Ivanhoe Creek.