Figure 17. Cross section through five published paleomagnetic sections in southwestern San Juan Basin. (Section localities are shown on Figure 3 and Figure 4; full data plots for all sections are on the figures indicated.) Section HW from Fassett and Steiner (1997), four other sections from Lindsay et al. (1981); labels of magnetochrons and top of Ojo Alamo Sandstone are as shown by those authors. (Some magnetochron labels shown are now known to be incorrect as discussed in section of this paper labeled "Identification of Kirtland Formation-Ojo Alamo Sandstone Magnetochrons.") Columns are broken by a gap of 25 m to show position of top of chron C33n (C30n of Lindsay et al. 1981) at Hunter Wash and South Mesa localities at a reasonable scale. Alignment of column BTW is based on field measurements of distance from lowermost C29n data point to base of Ojo Alamo Sandstone at BTW locality.