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. 2014 May 19;111(22):7958–7963. doi: 10.1073/pnas.1402369111

Fig. 2.

Fig. 2.

Magnetic polarity stratigraphy of the La Sal section of the Los Colorados Formation (Left) with the preferred correlation to the Newark APTS (15, 34) adjusted to a U-Pb date (rounded to nearest 0.5 My) of 201.5 Ma for the beginning of CAMP volcanism in the Newark basin that is close to the end-Triassic extinction level (21). Magnetic polarity stratigraphy of the Los Colorados Formation section was based on the latitude of the site-mean VGPs with respect to the mean north paleopole (VGP rLat), where rLat approaching +90° is regarded as normal polarity, and rLat approaching −90° as reverse polarity. Filled or open bars in polarity columns denote intervals of normal or reverse polarity; chrons comprised of successive main normal and reverse polarity-paired intervals are designated by LC prefix for Los Colorados, E prefix for Newark, and H prefix for Hartford sequences. Tick marks next to the APTS chron column are for 405-ky Milankovitch cycles used for apportioning durations (12). Geologic time scale (GTS) (20) adjusted for magnetic correlations to Newark APTS (16, 18, 35).