The sequences of the Double Trouble corehole were dated using integrated strontium isotopic stratigraphy and calcareous nannoplankton, dinocyst, and planktonic foraminiferal biostratigraphy (Fig. F8; Table T7). The sequences in the Double Trouble corehole can, generally, be correlated to sequences previously identified on the New Jersey coastal plain. Sediments between 293.8 and 741.9 ft (89.6 and 226.1 m) are assigned to the Eocene. The sequence between 293.8 and 517.4 ft (89.6 and 157.7 m) is likely equivalent to Sequence E8 of Browning et al. (1996), but definitive age markers are absent. The sequence between 517.4 and 569.2 ft (157.7 and 173.5 m) is lower middle Eocene and can be assigned to either Sequence E6 or E6a. Sedimentation rates in the Eocene range from ~9 to 35 m/m.y. The slower sedimentation rates are likely minimum rates, as the sequences are thin and obtaining precise ages for tops and bottoms is difficult. Sedimentation rates for the Eocene average 26 m/m.y.
Sediments between 741.9 and 832.65 ft (226.1 and 253.8 m) are assigned to the Paleocene. The sequence between 818.8 and 822.95 ft (249.6 and 250.8 m) is slightly younger than the previously described Sequence Pa1b of Harris et al. (2010). The sequence deposited between 822.95 and 832.65 ft (250.8 and 253.8 m) is equivalent to either Sequence Pa1a or Pa0 of Harris et al. (2010). Sedimentation rates for the Paleocene average 15 m/m.y.