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Table 1 Comparison of various values between astronomic theoretical periods and predominant cycles of magnetic susceptibility from Tianzhu borehole.

From: Environmental magnetic record of the fluvial sediments from the Tianzhu borehole in Beijing for the last 800 ka

Astronomic theoretical periods Predominant cycles
(ka) Depth (m) Time (ka)
404 (Eccentricity 1)   
  34.1 189.5
131 (Eccentricity 5)   
124 (Eccentricity 3)   
99 (Eccentricity 4)   
*95 (Eccentricity 2) 17.1 95
53.6 (Obliquity 3) 10.2 56.7
41.0 (Obliquity 1)   
39.6 (Obliquity 2) 6.4 35.6
  5.1 28.3
23.7 (Precession 1)   
22.4 (Precession 2) 4.1 22.8
19.1 (Precession 3) 3.53 19.6
Accumulation rate: 18 cm/ka
  1. *The main astronomic theoretical period identified from the predominant cycles of magnetic susceptibility from the Tianzhu borehole.