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Earth, Planets and Space
Fig. 2. | Earth, Planets and Space

Fig. 2.

From: Long period astronomical cycles from the Triassic to Jurassic bedded chert sequence (Inuyama, Japan); Geologic evidences for the chaotic behavior of solar planets

Fig. 2.

Estimated average duration of individual chert-shale couplet based on the relationship between bed number and age for the Rhaetian, Hettangian to Pliensbachian, and Rhaetian to Pliensbachian bedded chert in the Inuyama area, central Japan. The average durations of the couplet were estimated from the intervals of interest divided by the number of beds (see text for details). The ranges of the estimated durations are based on errors in the ages of geological stage boundaries (Ogg, 2012; Ogg and Hinnov, 2012) and uncertainties in the stratigraphic positions of the geological boundaries described by Hori (1990), Sugiyama (1997), Carter and Hori (2005), and Gröcke et al. (2011). Radiolarian zones and stratigraphic distribution of selected taxa are from Hori (1990, 1997), Sugiyama (1997), Carter and Hori (2005), and Gröcke et al. (2011). Tethyan ammonite zone is after Ogg (2012), Ogg and Hinnov (2012).

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