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Figure 7.8 Diagram showing K-T boundary interval at the Sugarite locality with iridium concentrations (dotted line) and fern-spore spike (solid line defining shaded area) (modified from Pillmore et al. 1999). Note that the boundary is near the top of a coal bed about 2 m thick. Reprinted by permission.

Figure 7.8 Diagram showing K-T boundary interval at the Sugarite locality with iridium concentrations (dotted line) and fern-spore spike (solid line defining shaded area) (modified from Pillmore et al. 1999). Note that the boundary is near the top of a coal bed about 2 m thick. Reprinted by permission.

geochemical phenomenon may well become an additional method for defining the K-T boundary in terrestrial sections.

The City of Raton site (locality 43) also demonstrates the independence of palynological occurrences from facies control at the K-T boundary. At the City of Raton locality, three thin coal beds are present within a 3.3-m-thick sequence of mudstone, siltstone, and carbonaceous shale. In succession from bottom to top, the three coal beds are 71 cm, 41 cm, and 15 cm thick. The K-T boundary is found within a claystone layer, 17 to 20 cm below the uppermost coal bed

Figure 7.9 Photographs of the City of Raton locality at a distance and close up. a - The sign marks the locality for visitors; the indium-bearing layer is marked by the arrow. b - The top of the boundary claystone layer, which is several centimeters beneath a coal bed, is at the level of the knife blade. Scale is about 15 cm long.

Figure 7.9 Photographs of the City of Raton locality at a distance and close up. a - The sign marks the locality for visitors; the indium-bearing layer is marked by the arrow. b - The top of the boundary claystone layer, which is several centimeters beneath a coal bed, is at the level of the knife blade. Scale is about 15 cm long.

(Figure 7.9). Although it tends to blend in with the surrounding claystone, the K-T boundary layer can be distinguished lithologically, and it yields an iridium anomaly of about 1 ppb at its top (Pillmore et al. 1984). Thus, at this locality, the palynological extinction level is not in close proximity to a facies change, either a

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