Fig. 3.

Stratigraphic level versus age for correlation of magnetostratigraphy of the Los Colorados Formation to the Newark APTS shown in Fig. 2 (solid circles connected by solid lines, dashed over intervals including an unresolved short magnetozone) and ⁴⁰Ar/³⁹Ar dates on two tuffs from the Ischigualasto Formation (labeled ISCH-6-611 and Herr Toba) shown with 1σ analytical (internal) uncertainties [solid error bars (5)] and including external uncertainties (dashed error bars) suggested by ref. 8. Overall sediment accumulation rates implied by these data are indicated for each formation.