UMUT: Department of Historical Geology and Palaeontology, University Museum, University of Tokyo
MM6926-6935: Illustrated by Kanagawa and Ando (1983)
MM15710-15740: Illustrated by Ando (1984)
MM17576-17669: Registered in this paper

Horizons urrnnged in upward sequence unless otherwise stated.

Monotis sentiformis (Teller)

Utatsu samples (Sr)
Formation: Lower part of Saragaizaka For-mation, Saragai Group
1.Locality: Shirayamazawa, west to Isa-tomae, Utatsu Town, Miyagi Prefecture (Figs. 5, 20, 35)
Lithology: Coarse-to medium-grained sandstone
Horizon and composition:
1) Sr320la (UMUTMM17576) LV1, RV-1
2) Sr3201c (UMUTMM17577) LV 3, RV-1 0.2m
3) Sr3201d (UMUTMMl5710-l5714, 17578) LV-28, RV-13
4) Sr320le (UMUTMM17579) LV-23,RV-9
2. Locality: West coast of Niranohama, Shizukawa Town, Miyagi Prefecture Lithology: Muddy and anndy limestone Homon: Srll50 (UMUTMM15739, 17580) rock specimens

Kesennuma samplea (Kc)
Formation: Saragaizaka Formation, Saragai Group
Locality: Sarukake, Kesennuma City, Miyagi Prefecture. (Figs. 2, 3)
Lithology: Micaceous coarse-to medium-grained sandstone
Horizon and composition:
1) Keh (UMUTMM17581) LV=14, RV=14
2) Kei (UMUTMM17582) RV=2
3) Kel (UMUTMM17583) LV= 2, RV=3
4) Kep (UMUTMM17584) LV=4, RV=3
5) Keq (UMUTMM17585) LV=2, RV=2

Asu samples (As)
Formation: Kamosho Formation, Hnbu Group
Locality: Kamono-sho, Asa, Sanyo Town, Yamaguchi Prefecture (Fig. 9)
Lithology: Micaceous sandy mudstone Horizon and composition:
1) As6 (UMUTMM17586) LV= 6, RV=3
2) As5 (UMUTMM17587) LV=8, RV=11

Muknihata sample (Mu)
Formation: Mukaihata Formation
Locality: Mukaibata, Miwa Town, Yama-guchi Prefecture (Hase, 1961; Toyohara, 1977, fig. 8)
Lithology: Silicitied sandy mudstone
Collector: Hase, A. (1961)
Composition: Plicated form, LV=14, RV=23; Non- or weakly-plicated form, LV=6, RV=1 (IGSH-HA 311-316, 321-342)
Repository: Inatitate of Geology and Miner-alogy, Faculty of Seience, Hiroshima Uni-versity, Hiroshima, Japan

Monotis ochotica densistriata (Teller)

Shuzan samples (Sh)
Formation: l-sandstone, Tamba Group
Locality: South of Kurio, Shuzan, Keihoku Town, Kyoto Prefecture (Fig. 11)
Lithology: Laminated sandy mudstone Horizon:
1) Sh2 (UMUTMM17593)
2) Sh4 (UMUTMM17594)

Nariwa samples (Na)
Formation: Jito Formation, Nariwa Group (Figs. 8, 19)
Locality: Eda, Nariwa Town, Okayama Prefecture
Lithology: Sandy mudstone Horizon and composition: stratigraphic relation obscure, nearly the same horizon
1) Na4015a (UMUTMM17595) LV=13, RV=18
2) Na4015b (UMUTMM17596) LV=4, RV=8
3) Na4015c (UMUTMM17597) LV=12, RW=13

Itsukaichi sample (Ichikawa, 1951b)
Formation: Kayakubo Formation (Ozawa and Kobayashi, 1985)
Locality: A small valley, Kaizawa Valley at Iwai, Oguno Village, Tokyo Prefecture
Lithology: Medium-grained sandstone
Composition: LV=2 (UMUTMM5369, 5370)

Sakawa sample (Kobayashi and Ichikawa, 1949, 1950)
Locality: Owada-magarita, Hidaka Village, Kochi Prefecture
Lithology: Sandy mudstone
Composition: A slab with crowded shells (UMUTMM5283)

Itadorigawa sample (It)
Locality: Derived boulders south of Ita-dorigawa, Shirokawa Town, Ehime Pre-fecture (Fig. 13)
Lithology: Tuffaceous sandy limestone
Horizon: It1, 2 (UMUTMM17598)
Miyamadani samples (My)
Locality: Miyamadani, Izumi Village, Ku-mamoto Prefecture (Figs. 15, 16, 21)
Lithology: Muddy fine-grained sandstone
Horizon and composition:
1) My1a (UMUTMM17599) LV=2, RV=2
2) My1b (UMUTMM17600) LV=1, RV=3
3) My1e (UMUTMM17601) LV=1

Monotis ochotica ochotica (Keyserling)

Utatsu samples (Sr)
Formation: Middle part of Saragaizaka For-mation, Saragai Group
Locality: Shirayamazawa, west to Isatomae, Utatsu Town, Miyagi Prefecture (Figs. 5, 20, 35)
Lithology: Sandy mudstone to fine- to medium-grained sandstone
Horizon and composition:
1) Sr3204a (UMUTMM17602) LV=12, RV=25
2) Sr3204b (UMUTMM17603, 15720) LV=60, RV=32
3) Sr3204c (UMUTMM17604) LV=7, RV=5
4) Sr3205d (UMUTMM17605, 15721-1572S) LV=67, RV=31
5) Sr3207 (UMUTMM17606, 15726, 15727) LV=16, RV=36
6) Sr3207d (UMUTMM17607)

Ofunato sample (Of) (Kanagawa and Ando, 1983)
Formation: Myojinmae Formation
Locality: Myojinmae, Ofunato-cho, Ofuna-to City, Iwate Prefecture (Kanagawa and Ando, 1983, figs. 1, 2)
Lithology: Tuff and volcanic sandstone peb-bles in volcanic conglomerate
Composition: LV=6, RV=6 (UMUTMM 6926-6935)

Okutone samples (Ok)
Formation: Oikkui Formation, Okutone Group
Locality: Uramiyajizawa Valley, a small branch of Idozawa Valley which is a tribu-tary of the Tone River, Minakami Town, Gunma Prefecture (Fig. 6)
Lithology: Mudstone
Horizon and composition:
1) Ok6 (UMUTMM17608) LV=29, RV=39
2) Ok7 (UMUTMM17609) LV= 6, RV=8

Myogatani sample (Myo)
Formation: Myogatani Formation
Locality: Myogatani, Kasuga Village, Gifu Prefecture (Fig. 10)
Lithology: Sandy mudstone to muddy fine-grained sandstone
Composition: Myol (UMUTMM17610) LV=3, RV=9

Tsuyama samples (Ts)
Formation: Lower part of Shimoyama For-mation (Fig. 7)
1. Locality: North of Kaidosuji, Taguma, Tsuyama City, Okayama Prefecture
Lithology: Sandy mudstone
Horizon and composition:
1) Ts1001a (UMUTMM17611) LV=4, RV=1 0.6m
2) Ts1001b (UMUTMM17612) LV=2, RV=6 3m
3) Ts1001c (UMUTMM17613) RV=2 10.5m
4) Ts1001e (UMUTMM17614) LV=11, RV=9 3m
5) Ta1001f (UMUTMM17615) LV=1, RV=1 2m
6) Ts1001g (UMUTMM17616) LV=2, RV=1 0.9m
7) Ts1001h (UMUTMM17617) LV=1, RV=1
2. Locality: Natsume, Tsuyama City
Lithology: Sandy mudstone
Horizon and composition:
1) Ts2004a (UMUTMM17618) LV=2, RV=1
2) Ts2004b (UMUTMM17619) LV=2, RV=3
3) Ts2004c (UMUTMM17620) LV=9, RV=6
3. Locality: West of Odanaka, Tsuyama City
Lithology: Sandy mudstone
Horizon and composition: stratigraphic re-lation unknown
1) Ts4007 (UMUTMM17621) LV=3, RV=5
2) Ts4008 (UMUTMM17622) LV=3, RV=5 75m east to loc.Ts4007

Nariwa samples (Na)
Formation: Jito Formation, Nariwa Group (Fig. 8)
1. Locality: Yamamoto, Nariwa Town, Oka-yama Prefecture
Lithology: Muddy fine-grained sandstone
Composition: Na4243 (UMUTMM17623) LV=4, RV=3
2. Locality: A small valley aouthwest of Jito, Kawakami Town, Okayama Prefecture
Lithology: Sandy mudstone to muddy fine-grained sandstone
Horizon and composition:
1) Na1560a (UMUTMM17624)
2) Na1560b (UMUTMM17625)
3) Na1560c (UMUTMM17626)
4) Na1560c (UMUTMM17627)
5) Na1560e (UMUTMM17628)
6) Na1560f (UMUTMM17629)
7) Na1560g (UMUTMM17630)
8) Na1560h (UMUTMM17631)

Ohme sample (Takagi, 1944)
Formation: Kanyo Formation (Ozawa and Kobayushi, 1986)
Locality: Futamatao, Ohme City, Tokyo Prefecture
Lithology: Sandy mudstone
Composition: One left valve (UMUTMM 5069)

Sakuradani samples (Sa)
Formation: Kochigatani Group
Locality: A small valley southeast of Saka-shu Bridge, Sakashu, Kisawa Village, Toku-shima Prefecture (Ichikawa, 1954a, fig. 1, table 1, loc. 52KI-3)
Lithology: Calcareous, fine- to medium-grained sandstone and calcareous sandy mudstone
Horizon:
1) Sa3008 (UMUTMM17632)
2) Sa3009 (UMUTMM17633)

Itadorigawa sample (It)
Locality: Derived boulders from south of Itadorigawa, Shirokawa Town, Ehirne Pre-fecture (Fig. 13)
Lithology: Sandy limestone
Horizon: It1, 2 (UMUTMM17636)
Miyamadani samples (My)
Locality: Miyamadani, Izumi Village, Ku-mamoto Prefecture (Figs. 15, 16, 21)
Lithology: Sandy mudstone to fine-grained sandstone
Horizon and composition:
1) My1i (UMUTMM17637) LV=55, RV=16
2) My1j (UMUTMM17638) LV=12, RV=7
3) My1k (UMUTMM17639) LV=1, RV=6
4) My1l (UMUTMM17640) LV=9, RV=5
5) My1n (UMUTMM17641) LV=24, RV=7
6) My1o (UMUTMM17642) LV= 13, RV=9
7) My1p (UMUTMM17643)

Arase samples (Ar)
Formation: Arase 'Monotis' Bed (Fig. 17)
1. Locality: Ridge on Fujimoto Tunnel, Arase, Sakamoto Villnge, Kumamoto Prefecture
Lithology: Sandy mudstone
Horizon and composition: Ar1102 (UMU TMM17644) LV=7, RV=6
2. Locality: Small valley south of Fujimoto, Arase, Sakamoto Village
Horizon and composition:
1) Ar1301a (UMUTMM17645) LV=19, RV=15
2) Ar1301b (UMUTMM17646) LV=11, RV=10
3) Ar1301c (UMUTMM17647) LV=12, RV=4

Takagochi samples (Ta)
Formation: Takagochi Formation
Locality: Takagochi, Yatsushiro City, Ku-mamoto Prefecture (Fig. 18)
Lithology: Sandy mudstone to muddy fine-grained sandstone
Horizon and composition:
1) Ta29 (UMUTMM17648) LV=52, RV=45
2) Ta35 (UMUTMM17649) LV=25, RV=26

Monolis zahaikalica (Kiparisova)

Utatsu samples (Sr)
Formation: Upper part of Saragaizaka For-mation, Saragai Group
1. Locality: Shirayamazawa, west of Isa-tomae, Utatsu Town, Miyagi Prefecture (Figs. 5, 20, 35)
Lithology: Medium- to coarse-grained sand-stone and glauconitic calcareous sandy mudstone
Horizon and composition:
1) Sr3208c (UMUTMM17650, 15730) LV=3, RV=4 0.2m
2) Sr3208 (UMUTMM17651, 15728-15730) LV=19, RV=34
3) Sr3209 (UMUTMM17652, 15731-15733) LV=19,RV=18
4) Sr3210a (UMUTMM17653, 15734-15736) LV=6, RV=2 0.3m
5) Sr3210b (UMUTMM17654) LV=3, RV=7
6) Sr3213 (UMUTMM17655, 15737, 15738) LV=4, RV=4
2. Locality: Small valley northeast of Hosoura, Shizukawa Town, Miyagi Pre-fecture (Fig. 20)
Lithology: Black mudstone
Horizon: Sr3407b (UMUTMM17656)

Okutone sample (Ok)
Formation: Oikkui Formation, Okutone Group
Locality: Uramiyajizawa Valley, a small branch of Idozawa Valley which is a tribu-tary of the Tone River, Minakami Town, Gunma Prefecture (Fig. 6)
Lithology: Calcareous mudstone
Horizon: Ok5 (UMUTMM17657)

Sakawa samples (Sk)
Formation: Upper part of Kochifiatani Group
Lithology: Sandy mudstone to fine-grained sandstone
1.Kobayashi and Ichikawa (1949, 1950)
Locality: Sakuradani, Kochigatani, Sukawa Town, Kochi Prefecture
Composition: Five left valves (UMUTMM 5253, 5254, 5256, 5258) and four right valves (UMUTMM5255, 5257, 5260, 5261)
2. Locality: Owada, Hidnka Village, Kochi Prefecture (Fig. 12) Horizon:
1) Sk3009 (UMUTMM17658)
2) Sk3018 (UMUTMM17659)

Kubodani samples (Ku)
Locality: Kubodani, Nomura Town, Ehime Prefecture (Fig. 14)
Lithology: Calcareous medium- to coarse-grained sandstone and sandy mudstone
Horizon: In ascending order with in bed 5m thick
1) Ku10a (UMUTMM17660)
2) Ku10f (UMUTMM17661)
3) Ku10e (UMUTMM17662)
4) Ku10c (UMUTMM17663)

Monotis mabara (Kobayashi and Ichikawa)

Utatsu sample (Sr)
Formation: Uppermost part of Saragaizaka Formation, Saragai Group
Locality: Small valley, north of Hosoura, Shizukawa Town, Miyagi Prefecture (Fig. 20)
Lithology: Black calcareous sandy mudstone
Horizon: Sr3407b (UMUTMM17656) LV=1

Sakawa samples (Sk) Lithology: Fine- to medium-grained sand-stone
1. Kobayashi and Ichikawa (1949, 1950)
1) Locality: Kasayadani, east of Kochi-gatani, Sakawa Town, Kochi Prefecture
Composition: Two left valves (UMUTMM 5276,5278)
2) Locality: Snkonoshiri, near the south-ern exit of Akatsuchi Tunnel, Kochigatani, Sakawa Town
Composition: One right valve (UMUTMM 5277)
2. Locality: Owada, Hidaka Village, Kochi Prefecture (Fig. 12) Horizon:
1) Sk3009 (UMUTMM17658)
2) Sk3018 (UMUTMM17659)

Kubodani samples (Ku)
Locality: Kubodani, Nomura Town, Ehime Prefecture (Fig. 14)
Lithology: Calcareous medium- to coarse-grained sandstone and sandy mudstone
Horizon: In ascending order among 5m thick
1) Ku10n (UMUTMM17660)
2) Ku10e (UMUTMM17662)
3) Ku10d (UMUTMM17664)

4) Ku10c (UMUTMM17663)
Miyamadani samples (My)
Locality: Miyamadani, Izumi Village, Ku-mamoto Prefecture (Figs, 15, 21)
Lithology: Fine-grained sandstone Horizon and composition:
1) My1q (UMUTMM17665) LV=6
2) My1r (UMUTMM17666) RV=2
3) My1s (UMUTMM17667) LV=1
4) My1t (UMUTMM17668) LV=4
5) My1u (UMUTMM17669A) LV=4, RV=1
6) My1v (UMUTMM17669B) LV=6, RV=5
7) My1w (UMUTMM17669C) LV=1