Age, magnetostratigraphy, and paleolatitude of the Newark basin composite stratigraphic section. The lithologic section is shown at left. Abbreviations are: St, Stockton Formation; Lt, Lockatong Formation; Pc, Passaic Formation; Om, Orange Mountain Basalt; Ft, Feltville Formation, Pr, Preakness Basalt; To, Towaco Formation; Hm, Hook Mountain Basalt; Bt, Boonton Formation. The absolute age of the Newark basin section is shown at right, along with the period and stage names of the geologic time scale. The magnetic-reversal stratigraphy is shown at center left (black is normal polarity). In addition to providing a magnetic reversal stratigraphy, paleomagnetism can also indicate the paleolatitude of a rock at the time the magnetization was acquired. This is because the orientation of the Earth's magnetic field varies with latitude. The oldest strata in the Newark basin were deposited when the basin was located ~3° north of the equator, whereas the youngest strata were deposited when the basin was located ~9° north of the equator. Modified from Kent et al. (1995).