Table AT3. Maastrichtian–Campanian paleomagnetic analysis, Hole 1257C.
Core, section,
interval (cm)
Depth
(mcd)
Demagnetization
(mT/°C)
Declination
(°)
Inclination
(°)
ChRM intensity
(mA/m)
Error
Polarity assignments
Comments
207–1257C–

   




7R–5, 130 148.76

   






NRM 0
330.9 50.7
1.52E–02
0.08

Hook–type swing in declination


AF 50
331.0 19.9
6.23E–03
0.09
RP


AF 50
328.0 16.6
6.24E–03
0.07




TT 150
226.3 51.6
1.28E–02
0.07
C31r


TT 150
223.2 50.5
1.18E–02
0.04




TT 200
118.3 52.1
3.34E–03
0.17




TT 200
128.7 48.1
3.20E–03
0.11




TT 250
142.6 19.8
5.04E–03
0.09




TT 250
137.5 24.8
5.45E–03
0.21




TT 300
137.9 29.9
3.69E–03
0.19




TT 300
138.1 36.3
3.90E–03
0.22




TT 350
198.8 4.6
3.61E–03
0.09




TT 350
212.4 –0.4
3.85E–03
0.07


9R–1, 80 161.91

   






NRM 0
63.3 27.0
2.02E–01
0.04




AF 50
57.3 24.6
1.55E–01
0.06

N–type


TT 150
55.2 20.9
1.32E–01
0.04

relatively strong


TT 200
51.4 21.0
1.08E–01
0.06
NP


TT 240
51.4 18.0
1.01E–01
0.05




TT 270
51.1 20.1
1.01E–01
0.04
C32n


TT 300
49.0 22.7
7.44E–02
0.05




TT 330
53.4 12.9
6.29E–02
0.05




TT 360
46.4 8.2
4.56E–02
0.05




TT 400
44.8 17.0
4.86E–02
0.04


9R–3, 84 164.95

   






NRM 0
61.9 41.9
5.35E–02
0.05

N–type


NRM 0
61.9 41.9
5.35E–02
0.05
NP


AF 50
45.6 34.1
3.35E–02
0.04




AF 50
45.6 34.1
3.35E–02
0.04




TT 150
39.3 28.2
2.56E–02
0.11




TT 150
39.3 28.2
2.56E–02
0.11




TT 200
36.3 35.8
1.54E–02
0.21




TT 200
36.3 35.8
1.54E–02
0.21




TT 240
36.6 39.5
1.59E–02
0.06




TT 240
36.6 39.5
1.59E–02
0.06




TT 300
33.4 33.4
1.41E–02
0.06




TT 300
33.4 33.4
1.41E–02
0.06


9R–5, 41 167.46

   






NRM 0
245.0 31.7
4.25E–02
0.14

Hook–type


AF 50
244.2 7.5
4.78E–02
0.04
RP


TT 150
235.6 6.4
6.13E–02
0.12




TT 200
237.9 2.5
5.94E–02
0.07
C32r


TT 240
242.7 –3.8
5.70E–02
0.09




TT 300
234.2 –3.4
4.68E–02
0.04


9R–6,59 168.64

   






NRM 0
270.5 78.8
1.65E–01
0.02

Begins steep down


AF 50
309.4 69.9
8.75E–02
0.01

Sort–of–hook


TT 150
323.7 61.5
6.93E–02
0.08
RP


TT 200
335.8 37.8
4.63E–02
0.05




TT 240
339.0 36.1
4.06E–02
0.05




TT 270
338.1 36.0
3.76E–02
0.04




TT 300
333.2 14.9
2.98E–02
0.08




TT 300
331.7 14.1
3.00E–02
0.07




TT 330
328.1 0.5
2.25E–02
0.09




TT 360
334.3 0.0
2.33E–02
0.08




TT 400
335.8 8.3
2.25E–02
0.06


Notes: NRM = natural remanent magnetization, AF = alternating–field demagnetization, TT = thermal demagnetization. Characteristic direction polarity ratings: NP or RP = less precise directions computed from only two vectors or a suite of vectors displaying high dispersion.