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Middle Permian Ammonoids from the Kamiyasse-Imo District in the Southern Kitakami Massif, Northeast Japan

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Middle Permian Ammonoids from the Kamiyasse-Imo District in the Southern Kitakami Massif, Northeast Japan Paleontological Research, vol. 9, no. 1, pp. 1–14, April 30, 2005 6 by the Palaeontological Society of Japan Middle Permian ammonoids from the Kamiyasse-Imo district in the Southern Kitakami Massif, Northeast Japan MASAYUKI EHIRO1 AND AKIHIRO MISAKI2 1The Tohoku University Museum, Sendai 980-8578, Japan (e-mail: [email protected]) 2Institute of Geology and Paleontology, Tohoku University, Sendai 980-8578, Japan (Present address: Division of Earth and Planetary Sciences, Graduate School of Science, Kyoto University) Received April 23, 2004; Revised manuscript accepted January 11, 2005 Abstract. Middle Permian ammonoid faunas are recognized from the Hosoo and Kamiyasse Formations in the Kamiyasse-Imo district, north of Kesennuma, Southern Kitakami Massif, Northeast Japan. The fau- nas comprise the following genera: Parastacheoceras, Demarezites, Demarezites?, Waagenoceras, Timor- ites, Tauroceras?, Cardiella, Adrianites, Agathiceras, Agathiceras?, Paraceltites and Cibolites. Para- stacheoceras bidentatus gen. and sp. nov. is newly proposed. The genera Demarezites, Tauroceras, Cardiella and Adrianites are described for first time from Japan. Based on these ammonoids, the middle part of the Hosoo Formation, upper part of the Hosoo Formation to the lower middle part of the Kamiyasse Forma- tion, and upper middle part of the Kamiyasse Formation are correlatable with the Middle Permian Road- ian, Wordian and Capitanian, respectively. The discovery of genera Demarezites and Cardiella strongly supports the previous hypothesis that the South Kitakami Paleoland was located in the equatorial province during the Middle Permian. Key words: Middle Permian ammonoid, Kamiyasse, Imo, Southern Kitakami, Equatorial Tethyan Province Introduction been established, although the ammonoids indicated above are excellent index fossils. The Southern Kitakami Massif, Northeast Japan Recently we obtained some ammonoids from the occupies the southern half of the Kitakami Massif and Middle Permian strata in the district, with precise geotectonically belongs to the South Kitakami Belt. geographic and stratigraphic data, that include genera The belt was a part of the South Kitakami Paleoland important for biostratigraphy and paleobiogeography. (Ehiro, 1997), in which fossiliferous shallow marine The purpose of this paper is to describe these ammo- sediments were deposited during Middle Paleozoic to noids, to correlate the Middle Permian formations earliest Cretaceous time. The Kamiyasse-Imo district, in the Kamiyasse-Imo district with the global stan- north of Kesennuma City, Southern Kitakami Massif dard section, and to discuss their paleobiogeographic (Figure 1), has been well-known in Japan for its Per- significance. mian fossil localities and many paleontological studies have been carried out there (see Onuki, 1969; Tazawa, Regional geology and ammonoid faunas of the 1976). The previously known Middle Permian fauna Hosoo and Kamiyasse Formations includes some age-diagnostic genera, such as Waagen- oceras, Timorites, Paraceltites and Cibolites (Haya- The Kamiyasse-Imo district is situated in the border saka, 1940, 1963; Koizumi, 1975; Ehiro and Araki, area between Kesennuma City, Miyagi Prefecture and 1997). However, except for that described by the last Rikuzentakata City, Iwate Prefecture. The Kamiyasse authors, detailed stratigraphic and geographic infor- district belongs to Kesennuma City and Imo district is mation for this material is absent. For instance, local- in the southwestern part of Rikuzentakata City. The ities have merely been described as ‘‘Imo’’ or ‘‘Ka- Permian strata from the area have been divided in as- miyasse’’ with no stratigraphic data. Therefore, precise cending order into the Nakadaira, Ochiai and Nabe- ammonoid-based correlation for the Middle Permian koshiyama Formations (Ehiro, 1977). The middle part formations in the Kamiyasse-Imo district has not yet of the Ochiai Formation, dominated by calcareous 2 Masayuki Ehiro and Akihiro Misaki this formation. We collected the following ammonoids from the middle and upper parts of this formation. Fossil localities and horizons are shown in Figures 2 and 3, respectively, and these ammonoid fossils are figured in Figures 4–7. Loc. H-1 (Upper reaches of the Funaochizawa val- ley, a tributary of the Imosawa River in the Imo district): Demarezites?sp.andAgathiceras?sp., from loose mudstone blocks probably derived from the middle part of the Hosoo Formation. Loc. H-2 (Middle reaches of the Hachirozawa val- ley, a tributary of the Imosawa River): Adrianites sp., from mudstone of the middle part of the Ho- soo Formation. Loc. H-3 (Mouth of a small tributary of the Imo- sawa River): Demarezites sp. and Agathiceras sp., from mudstone of the middle part of the Ho- soo Formation. Loc. H-4 (Eastern ridge of the Ookadozawa valley, a tributary of the Hosoozawa River in the Ka- miyasse district): Cardiella sp., Waagenoceras sp. Agathiceras sp. and Paraceltites elegans Girty, Figure 1. Location map of the study area. from mudstone of the upper part of the Hosoo Formation. Loc. H-5 (Road-cut along the forest road in the southern basin of the Shigejizawa River in the sandstone and impure limestone, was separated into Kamiyasse district): Parastacheoceras bidentatus the Toyazawa Member. Recently, Misaki and Ehiro Ehiro and Misaki (gen. and sp. nov.), Tauroceras? (2004) reexamined the stratigraphy of the Ochiai For- sp. and Agathiceras sp., from laminated mudstone mation and divided it into the Hosoo, Kamiyasse and of the uppermost part of the Hosoo Formation. Kurosawa Formations from lower to upper (Figures 2 and 3). They roughly correspond to the lower, middle The Kamiyasse Formation ranges in thickness from (Toyazawa Member) and upper parts of the Ochiai 200 to 300 m and is dominated by calcareous sand- Formation, respectively. Permian strata having the stone, calcareous mudstone and impure limestone. same stratigraphy also occur in the Shishiori district, This formation yields many fusulinoideans, corals, Kesennuma City, to the east of Kamiyasse and to the brachiopods, molluscs and other fossils. Tazawa (1973, south of Imo. 1976) established two fusulinoidean zones in the Ka- The Nakadaira Formation distributed mainly in miyasse Formation: the lower Monodiexodina matsu- the Kamiyasse district consists predominantly of lime- baishi Zone and the upper Lepidolina multiseptata stone intercalated with conglomerate, sandstone and Zone. M. matsubaishi (Fujimoto), the index species of mudstone. The limestone yields the Early Permian the M. matsubaishi Zone, dominates in the lower and fusulinoideans Robustoschwagerina schellwieni Han- middle parts of this formation, but ranges upwards zawa and Pseudofusulina fusiformis (Schellwien and into the lower part of the L. multiseptata Zone (Ehiro Dyhrenfurth) (Tazawa, 1973, 1976), thus establishing and Misaki, 2004). The Wordian fusulinoidean genus a Sakmarian-Artinskian (Early Permian) age for the Cancellina has been reported from the lower part of formation. the M. matsubaishi Zone in the Setamai district of the The Hosoo Formation, 400 to 500 m thick, is pri- Southern Kitakami Massif (Choi, 1973). The L. multi- marily a mudstone unit with some lenticular sandstone septata Zone is characterized by L. multiseptata De- beds. One of the sandstone beds intercalated in the prat and Verbeekina verbeeki (Geinits). Genus Lep- upper horizon is rather thick in the northern part of idolina is widely accepted as an index fossil of the the Kamiyasse district, but thins laterally. No age- Capitanian. The Kamiyasse Formation yields the fol- diagnostic fossils had been reported previously from lowing ammonoids: Waagenoceras, Timorites, Para- Middle Permian ammonoids from Kitakami 3 Figure 2. Geologic map of the Kamiyasse-Imo district, Southern Kitakami Massif, Northeast Japan (simplified from Misaki and Ehiro, 2004), showing the ammonoid localities. Latitude and longitude values are referred to the Tokyo Datum. Plus 10.5 00 to the latitude and minus 12.7 00 to the longitude for the Japanese Geodetic Datum 2000. 4 Masayuki Ehiro and Akihiro Misaki Figure 3. Generalized columnar section of the Permian formations in the Kamiyasse-Imo district (simplified from Misaki and Ehiro, 2004). Stratigraphic distributions of ammonoid fossils are also shown. Middle Permian ammonoids from Kitakami 5 Figure 4. Middle Permian ammonoids from the middle part of the Hosoo Formation. 1. Agathiceras sp., IGPS coll. cat. no. 109435, dorsal view, Â1.3. 2. Agathiceras? sp., IGPS coll. cat. no. 109439, lateral view, Â1.8. 3. Demarezites sp., IGPS coll. cat. no. 109430, ventral (a) and dorsal (b) views, Â1.0. 4. Demarezites? sp., IGPS coll. cat. no. 109431, lateral view, Â1.05. 5. Adrianites sp., IGPS coll. cat. no. 109434, lateral (a) and ventral (b) views, Â1.8. The Kamiyasse Formation yields the following ammonoids (Figures 8 and 9). Two specimens from locality Ky-3, housed in the Rikuzentakata City Mu- seum, are also listed here. Loc. Ky-1 (Middle reaches of the Toyazawa River in the Shishiori district): Cibolites cf. uddeni Plummer and Scott, from mudstone intercalated in the sandstone beds of the middle part of the Kamiyasse Formation. Loc. Ky-2 (Upper reaches of the Nidanosawa Val- ley, a southern tributary of the Shigejizawa River): Cibolites cf. uddeni Plummer and Scott, from sandstone float, which contains many specimens of fusulinoidean species Monodiexodina matsu- baishi (Fujimoto). This ammonoid specimen pre- sumably came from the middle part of the Ka- miyasse Formation, because rocks
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