District | Formation | Lithology | Microfossils | Biozone | Bathymetry |
---|---|---|---|---|---|
1. Hokkaido (north) | Yuchi/Mochikubetsu | Fine sandstone | NPD9 (younger than 2.4 Ma) (Akiba, 2001) | ||
NPD8 (Sagayama, 2003) | |||||
Koetoi/Enbetsu | Diatomaceous mudstone | Diatom (Akiba, 2001) | NPD7B–NPD8 (Akiba, 2001) | ||
2. Hokkaido (southwest) | Setana/Urura | Medium–coarse sandstone | Foraminifera (Nojo et al., 1999; Nemoto and Oikawa, 2006), nannofossil (Nojo et al., 1999) | CN13b–CN14a, PF8 (Nojo et al., 1999) | Sublittoral to upper bathyal (Nemoto and Oikawa, 2006) |
Kuromatsunai (type locality) | Medium sand–siltstone | Foraminifera (Masatani and Ohkura, 1980; Tsubakihara et al., 1989), diatom (Masatani and Ohkura, 1980; Tsubakihara et al., 1989) | NPD9 (Tsubakihara et al., 1989) | Lower sublittoral to middle bathyal (Masatani and Ohkura, 1980) | |
Tate | Diatomaceous siltstone | Foraminifera (Masatani and Ohkura, 1980), diatom (Masatani and Ohkura, 1980) | NPD7B–NPD8 (Masatani and Ohkura, 1980) | Sublittoral to bathyal (Masatani and Ohkura, 1980) | |
3. Shimokita Peninsula | Hamada | Sandstone–siltstone | Foraminifera (Sugawara et al., 1997; Nemoto and Yoshimoto, 2001), Ostracoda (Ozawa and Domitsu, 2010) | CN13 (ca. 1.2–1.5 Ma, Sugawara et al., 1997) | Upper shelf to inner bay (Ozawa and Domitsu, 2010), inner sublittoral to upper bathyal (Nemoto and Yoshimoto, 2001) |
PF7 (Sugawara et al., 1997) | |||||
4. Tsugaru | Daishaka | Fine–medium sandstone | Foraminifera (Hata and Nemoto, 2005), Ostracoda (Ozawa, 2007) | PF8/PF9 (Hata and Nemoto, 2005) | Sublittoral to upper bathyal (Hata and Nemoto, 2005) |
Tsukushimoriyama | Fine sandstone–siltstone | Foraminifera (Hata and Nemoto, 2005) | PF7 (Hata and Nemoto, 2005) | Upper bathyal (Hata and Nemoto, 2005) | |
Narusawa | Fine sandstone | Nannofossil (Okada, 1988), Foraminifera (Matoba, 1988), diatom (Maruyama, 1988; Akiba and Hiramatsu, 1988) | CN12 (Okada, 1988) | Upper bathyal (Matoba, 1988) | |
NPD8 (Akiba and Hiramatsu, 1988) | |||||
NPD9 (according to present of N. seminae in occurrence list of Maruyama, 1988) | |||||
Maido | Diatomaceous, siltstone | Foraminifera (Nemoto 1990), Radiolaria (Hanagata and Miwa, 2002), diatom (Maruyama, 1988; Akiba and Hiramatsu, 1988) | PF6–PF7 (Nemoto 1990) | Middle/lower bathyal (lower part: Matoba, 1988) to upper bathyal (upper part: Nemoto 1990) | |
L. pylomaticus–C. sakaii zone (Hanagata and Miwa, 2002) | |||||
5. Akita (Oga Peninsula) | Kitaura | Alternations of fine sandstone and siltstone | Foraminifera (Sato et al., 1988a), nannofossil (Sato et al., 1988a) | PF7 (Sato et al., 1988a) | Upper bathyal (according to the U. subperegrina assemblage) |
U. subperegrina zone (Sato et al., 1988a) | |||||
CN13 including datum 12 to 6 of Sato et al. (2009), (Sato et al., 1988a) | |||||
Funakawa | Diatomaceous mudstone–siltstone | Foraminifera (Sato et al., 1988a), nannofossil (Sato et al., 1988a), Radiolaria (Hanagata et al. 2001b) | M. echigoensis zone (Sato et al., 1988a; Hanagata et al. 2001b) | Middle bathyal (according to the M. echigoensis assemblage) | |
L. pylomaticus–C. sakaii zone (Hanagata et al. 2001b) | |||||
5. Akita (Sasaoka area) | Sasaoka | Fine sandstone–siltstone | Foraminifera (Sato et al., 1988a), nannofossil (Sato et al., 1988a), Ostracoda (Yamada et al., 2002; Irizuki and Ishida, 2007) | C. yabei zone (Sato et al., 1988a) | Sublittoral (according to the C. yabei assemblage) |
Tentokuji | Siltstone–mudstone | Foraminifera (Sato et al., 1988a; Hanagata and Watanabe, 2001), nannofossil (Sato et al., 1988a; Hanagata and Watanabe, 2001) | PF6–PF7 (Hanagata and Watanabe, 2001) | Upper bathyal (Hanagata and Watanabe, 2001) | |
CN12 including Datum A (Sato et al., 1988a; Hanagata and Watanabe, 2001) | |||||
M. echigoensis to U. subperegrina zone (Sato et al., 1988a; Hanagata and Watanabe, 2001) | |||||
6. Niigata | Haizume | Sandy siltstone–sandstone | Foraminifera (Sato et al., 1987), nannofossil (Sato et al., 1987) | PF8 (Sato et al., 1987) | Sublittoral (according to the C. yabei assemblage) |
C. yabei zone (Sato et al., 1987) | |||||
Nishiyama | Siltstone–mudstone | Foraminifera (Sato et al., 1987), nannofossil (Sato et al., 1987) | PF7 (Sato et al., 1987) | Upper bathyal (according to the U. subperegrina assemblage) | |
U. subperegrina zone (Sato et al., 1987) | |||||
Tanihama | Siltstone | Foraminifera (Watanabe, 1976), diatom (Yanagisawa and Amano 2003) | NPD9 (Yanagisawa and Amano 2003) | Upper bathyal (according to the U. subperegrina assemblage) | |
U. subperegrina zone (Watanabe, 1976) | |||||
Nadachi | Mudstone | Foraminifera (Watanabe, 1976), diatom (Yanagisawa and Amano 2003) | NPD8 (Yanagisawa and Amano 2003) | Upper bathyal (according to the U. subperegrina assemblage) | |
U. subperegrina zone (Watanabe, 1976) | |||||
Kuwae | Siltstone–sandy siltstone | Foraminifera (Miwa et al., 2004a), diatom (Watanabe et al., 2003), nannofossil (Watanabe et al., 2003), Ostracoda (Yamada et al., 2005; Irizuki and Ishida, 2007; Irizuki et al., 2007) | PF7 (Miwa et al., 2004a) | Lower sublittoral to upper bathyal (Yamada et al. 2005) | |
NPD8–NPD9 (Watanabe et al., 2003) | |||||
Shiiya | Alternation of sandstone and mudstone | Foraminifera (Hanagata et al., 2001a), Radiolaria (Hanagata et al., 2001a) | L. pylomaticus–C. sakaii zone before 2.7 Ma (Hanagata et al. 2001a) | Middle bathyal (according to the M. echigoensis assemblage) | |
M. echigoensis zone (Hanagata et al. 2001a) | |||||
7. Hokuriku | Omma | Fine sand–very fine sand | Foraminifera (Hasegawa, 1979; Takayama et al., 1988; Kitamura et al., 2001; Takata, 2000), nannofossil (Takayama et al., 1988), Ostracoda (Ozawa and Kamiya, 2001; 2005) | Outer–inner sublittoral (Takata, 2000) | |
Junicho | Silty sandstone–sandy siltstone | Foraminifera (Hasegawa, 1979; Takayama et al., 1988), nannofossil (Hasegawa, 1979; Takayama et al., 1988) | CN13 including datum 12 to 11 of Sato et al. (2009) (Takayama et al., 1988) | Sublittoral (Takayama et al., 1988) | |
Yabuta | Fine sandstone–siltstone | Foraminifera (Hasegawa, 1979; Takayama et al., 1988; Miwa et al., 2004b), diatom (Watanabe, 2002), nannofossil (Takayama et al., 1988), Ostracoda (Cronin et al., 1994) | NPD7B–NPD9 (Watanabe, 2002) | Sublittoral to upper bathyal (Takayama et al., 1988; Cronin et al., 1994) | |
PF6–PF 7 (Miwa et al., 2004b) | |||||
8. Jeju Island | Sogwipo | Fine–coarse sandstone | Foraminifera (Kang et al., 2010), nannofossil (Yi et al. 1998), Ostracoda (Lee, 2014) | CN13a–CN14a (Yi et al. 1998) | Foreshore–inner shelf (Kang, 1995) |
9. Okinawa | Ryukyu Group | Bioclastic limestone/siltstone | Foraminifera (Yamamoto et al., 2003), nannofossil (Yamamoto et al., 2005) | CN13b–CN14a (Yamamoto et al., 2005) | Reef–shelf (Yamamoto et al., 2003) |
Shimajiri Group | Siltstone | Foraminifera (Ujiié and Kaneko, 2006), nannofossil (Tanaka and Ujiié 1984) | N16–N22 (Ujiié and Kaneko, 2006) | Upper bathyal (Ujiié and Kaneko, 2006) | |
CN9a–CN13a (Tanaka and Ujiié 1984) |