Figure F2. Age-depth plot for the Eocene-Oligocene interval of Hole 1138A. The curve is based on biostratigraphic and magnetostratigraphic data (M. Antretter et al., unpubl. data). The magnetostratigraphic timescale is taken from Cande and Kent (1995). Normal polarity is shown in black; reversed polarity is shown in gray. The black line is the estimated age-depth curve; the uncertainty interval is shaded yellow. All magnetostratigraphic chrons that can be assigned to a specific polarity interval of a core are plotted as boxes at the same depth as the core interval. The age curve must run through one of these boxes. Biostratigraphic events and zones used to constrain the magnetostratigraphic assignments are as follows: Nannofossils: N20: FO Discoaster multiradiatus (457.30-458.45 mbsf; 56.2 Ma); N21: LO Fasciculithus tympaniformis (449.60-450.35 mbsf; 5.3 Ma); N22: FO Tribrachiatus orthostylus (449.60-450.35 mbsf; 53.6 Ma); N23: FO Discoaster lodoensis (441.92-448.85 mbsf; 52.8 Ma); N24: FO Discoaster sublodoensis (441.92-448.85 mbsf; 49.7 Ma); N25: FO Nannotetrina spp. (429.55-430.38 mbsf; 47.3 Ma); N26: FO Chiasmolithus gigas (422.08-429.55 mbsf; 46.1 Ma); N27: LO C. gigas (405.90-406.65 mbsf; 44.5 Ma); N28: FO Reticulofenestra bisecta (356.20-357.19 mbsf; 38.0 Ma); N29: LO Chiasmolithus solitus (351.10-351.94 mbsf; 37.9 Ma); N30: FO Chiasmolithus (346.60-347.35 mbsf; 37.1 Ma); N31: FO Chiasmolithus oamaruensis (345.85-346.60 mbsf; 37.0 Ma); N32: FO Isthmolithus recurvus (344.35-345.10 mbsf; 35.7-36.3 Ma); N33: FO Reticulofenestra oamaruensis (342.85-343.60 mbsf; 35.4 Ma); N34-N39: Chiasmolithus altus zone (278.21-330.78 mbsf; 26.0-31.3 Ma); N40: R. bisecta zone (269.41 mbsf; 23.8-26.1 Ma); and N41: Zone CN2-CN1 (261.81 mbsf; 18.3-23.9 Ma). Foraminifers: F17-F19, F21: Zone AP11-AP10 (357.2-383.3 mbsf; 37.7-42.9 Ma); F20: LO Acarinina bullbrooki (354.5-365.6 mbsf; 40.5 Ma); F22: LO Acarinina primitiva (349.35-350.85 mbsf; 39.0 Ma); F23: LO Acarinina collactea (339.8-343.4 mbsf; 37.7 Ma); F24: LO Subbotina linaperta (339.8-343.4 mbsf; 37.7 Ma); F25: LO Globigerinatheka index (339.8-343.4 mbsf; 34.3 Ma); F26: Zone AP13 (340.60 mbsf; 30.0-34.3 Ma); F27: LO Subbotina angiporoides (324.45-335.25 mbsf; 30.0-30.5 Ma); F28-F29: Zone AP16-AP15 (278.21-285.85 mbsf; 23.8-28.5 Ma); F30: LO Globigerina euapertura (261.81-269.41 mbsf; 23.8 Ma); and F31: Zone NK1 (261.81 mbsf; 21.6-23.8 Ma).

Figure F2. Age-depth plot for the Eocene-Oligocene interval of Hole 1138A. The curve is based on biostratigraphic and magnetostratigraphic data (M. Antretter et al., unpubl. data). The magnetostratigraphic timescale is taken from Cande and Kent (1995). Normal polarity is shown in black; reversed polarity is shown in gray. The black line is the estimated age-depth curve; the uncertainty interval is shaded yellow. All magnetostratigraphic chrons that can be assigned to a specific polarity interval of a core are plotted as boxes at the same depth as the core interval. The age curve must run through one of these boxes. Biostratigraphic events and zones used to constrain the magnetostratigraphic assignments are as follows: Nannofossils: N20: FO Discoaster multiradiatus (457.30-458.45 mbsf; 56.2 Ma); N21: LO Fasciculithus tympaniformis (449.60-450.35 mbsf; 5.3 Ma); N22: FO Tribrachiatus orthostylus (449.60-450.35 mbsf; 53.6 Ma); N23: FO Discoaster lodoensis (441.92-448.85 mbsf; 52.8 Ma); N24: FO Discoaster sublodoensis (441.92-448.85 mbsf; 49.7 Ma); N25: FO Nannotetrina spp. (429.55-430.38 mbsf; 47.3 Ma); N26: FO Chiasmolithus gigas (422.08-429.55 mbsf; 46.1 Ma); N27: LO C. gigas (405.90-406.65 mbsf; 44.5 Ma); N28: FO Reticulofenestra bisecta (356.20-357.19 mbsf; 38.0 Ma); N29: LO Chiasmolithus solitus (351.10-351.94 mbsf; 37.9 Ma); N30: FO Chiasmolithus (346.60-347.35 mbsf; 37.1 Ma); N31: FO Chiasmolithus oamaruensis (345.85-346.60 mbsf; 37.0 Ma); N32: FO Isthmolithus recurvus (344.35-345.10 mbsf; 35.7-36.3 Ma); N33: FO Reticulofenestra oamaruensis (342.85-343.60 mbsf; 35.4 Ma); N34-N39: Chiasmolithus altus zone (278.21-330.78 mbsf; 26.0-31.3 Ma); N40: R. bisecta zone (269.41 mbsf; 23.8-26.1 Ma); and N41: Zone CN2-CN1 (261.81 mbsf; 18.3-23.9 Ma). Foraminifers: F17-F19, F21: Zone AP11-AP10 (357.2-383.3 mbsf; 37.7-42.9 Ma); F20: LO Acarinina bullbrooki (354.5-365.6 mbsf; 40.5 Ma); F22: LO Acarinina primitiva (349.35-350.85 mbsf; 39.0 Ma); F23: LO Acarinina collactea (339.8-343.4 mbsf; 37.7 Ma); F24: LO Subbotina linaperta (339.8-343.4 mbsf; 37.7 Ma); F25: LO Globigerinatheka index (339.8-343.4 mbsf; 34.3 Ma); F26: Zone AP13 (340.60 mbsf; 30.0-34.3 Ma); F27: LO Subbotina angiporoides (324.45-335.25 mbsf; 30.0-30.5 Ma); F28-F29: Zone AP16-AP15 (278.21-285.85 mbsf; 23.8-28.5 Ma); F30: LO Globigerina euapertura (261.81-269.41 mbsf; 23.8 Ma); and F31: Zone NK1 (261.81 mbsf; 21.6-23.8 Ma).