Table T14. Determinations of polarity chron boundaries, Site 1240.
Polarity
interval
202-1240A-
202-1240B-
Polarity chron
interpretation
Age
(Ma)
Depth
(mcd)
Comments
Depth
(mcd)
Comments
Upper 68.0


C1n (b) Matuyama/Brunhes
Middle
Core break

C1n (b) Matuyama/Brunhes 0.78
Lower 72.0


C1n (b) Matuyama/Brunhes







Upper 78.0


C1r.1n (t) Jaramillo
Middle
Core break

C1r.1n (t) Jaramillo 0.99
Lower 87.0


C1r.1n (t) Jaramillo







Upper 93.0
92.5
C1r.1n (b) Jaramillo
Middle
Mixed polarity
Core break C1r.1n (b) Jaramillo 1.07
Lower 132.0
99.5
C1r.1n (b) Jaramillo







Upper 162.0
168.5
C2n (t) Olduvai
Middle
Mixed polarity
Mixed polarity C2n (t) Olduvai 1.77
Lower 176.0
175.5
C2n (t) Olduvai







Upper 194.0
198.5
C2n (b) Olduvai
Middle
Mixed polarity
Core break C2n (b) Olduvai 1.95
Lower 206.0
201.0
C2n (b) Olduvai







Upper 256.5
251.0
C2An.1n (t) Gauss/Matuyama
Middle
Mixed polarity
Mixed polarity C2An.1n (t) Gauss/Matuyama 2.581
Lower 265.0
259.0
C2An.1n (t) Gauss/Matuyama

Note: (b) = bottom, (t) = top.