| Ichishi group distributes widly from Aki county to Matsuzaka city in Mie prefectue. The horizons are 25 Km from south to north in length and 15 km from east to west in width. One of the famous fossil producing site among the group locates along the Nagano River nearby the Kaisekiyama with the meaning of shell-stones mountain in japanese. The place yields a lot of fossils such as shells, whale bones and shark teeth . |
| Hexanchus sp |
| 15 mm w |
| Squalus serriculus JORDAN et HANNIBAL, 1923 |
| Squalus sp. |
| Squatina sp. |
| 5.2 mm W |
| left: Isurus hastalis (AGASSIZ, 1843), right: Isurus aff. planus (AGASSIZ, 1856) |
| Isurus oxyrinchus RAFINESQUE, 1810 |
| 39 mm H, 30 mm W |
| Carcharocles megalodon (AGASSIZ, 1843) |
| 63 mm W |
| Carcharias sp. |
| 43 mm H |
| Alopias latidens (LERICHE, 1909), |
| 7 mm H |
| Carcharhinus brachyurus (GÜNTHER,1870), far right; C. plumbeus (NARDO,1827) |
| Carcharhinus macloti (MÜLLER et HENLE , 1839) |
| Galeocerdo aduncus AGASSIZ, 1843 |
| 11 mm W |
| Negaprion cfr. acutidens (RÜPPELL, 1837) |
| 17 mm H |
| Rhizoprionodon sp. |
| 6 mm W |
| Unknown |
| 12 mm W |
Percentages of the species
| Species ..% | |||
| 1 | Carcharhinus spp. | 82.7 | |
| 2 | Isurus oxyrinchus | 5.6 | |
| 3 | Squalus sp. | 4,5 | |
| 4 | Galeocerdo aduncus | 1.5 | |
| 5 | Squatina sp. | 1.1 | |
| 6 | Carcharodon megalodon | 1.1 | |
| 7 | Hexanchus sp. | <1 | |
| 8 | I. hastalis | <1 | |
| 9 | I. paucus | <1 | |
| 10 | Carcharias sp. | <1 | |
| 11 | Negaprion sp. | <1 | |
| 12 | Rhizoprionodon sp. | <1 | |
| 13 | Alopias latidens | <1 | |
| 14 | unknown | <1 | |
| 2014 1104 | |||
Back & Forth
Fumio Nakagawa