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Ichishi G.
Early Middle Miocene, Mie Prefecture, Japan
ver. 1.3
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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 (R√úPPELL, 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


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Fumio Nakagawa

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