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Late Cretaceous Gastropods from the Izumi Group of Southwest Japan

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Late Cretaceous Gastropods from the Izumi Group of Southwest Japan See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/282543248 Late Cretaceous gastropods from the Izumi Group of southwest Japan Article in Journal of Paleontology · July 1990 DOI: 10.1017/S0022336000042608 CITATIONS READS 21 109 1 author: Tomoki Kase National Museum of Nature and Science, Tsukuba 160 PUBLICATIONS 1,423 CITATIONS SEE PROFILE Some of the authors of this publication are also working on these related projects: Epizoans, traces and predation on ammonoids and bivalves View project All content following this page was uploaded by Tomoki Kase on 03 February 2019. The user has requested enhancement of the downloaded file. J. Paleont., 64(4), 1990, pp. 563-578 Copyright ? 1990, The Paleontological Society 0022-3360/90/0064-0563$03.00 LATE CRETACEOUS GASTROPODS FROM THE IZUMI GROUP OF SOUTHWEST JAPAN TOMOKI KASE Department of Geology, National Science Museum, Tokyo 3-23-1 Hyakunincho, Shinjuku-ku, Tokyo 169 Japan ABsTRACTr-The basal part of the Upper Cretaceous, mid-Campanian to Maastrichtian Izumi Group of the Izumi Mountains and Awaji Island, Southwest Japan, contains the most diverse gastropod fauna of this age in Japan. This paper discriminates 19 species and describes two new genera: Atira tricarinata n. sp., Ataphrus (s.s.) sp. A, Ataphrus (s.s.) sp. B, Globularia (s.s.) izumiensis n. sp., Lysis izumiensis n. sp., Trichotropis? sp., Deussenia takinoikensis n. sp., Volutilithes antiqua n. sp., Pseudoperissitys bicarinata Nagao and Otatume, Nekewis sp., Nipponitys inouei n. gen. and sp., Nipponitys acutangularis n. gen. and sp., Nipponitys sp. cf. N. magna (Kalishevitsch), Calorebama cretacea n. sp., Taniella japonica n. gen. and sp., Amuletum (s.s.) sp., Biplica osakensis n. sp., Biplica sphaerica n. sp., and Cylichna sp. The family Ampullospiridae is assigned to the suborder Architaenioglossa from the superfamily Naticacea. The enigmatic genus Lysis is tentatively assigned to the Calyptraeidae. Taniella japonica n. sp. is the oldest member of the family Olividae, and Calorebama cretacea n. sp. is the oldest member of the subfamily Pseudolivinae. Occurrence of Atira, Ataphrus, Biplica, and five perissityids further supports close communication of the northwestern Pacific Late Cretaceous gastropod faunas with those of the North American Pacific coastal areas. INTRODUCTION The gastropods were collected from eight localities, seven in the Izumi Mountains area and one in the Awaji Island area THE CRETACEOUS molluscan faunas in Japan are dominated by ammonites and inoceramids, and, in general, (Figure 1). gastro- In the Izumi Mountains area one locality (NSM- pods are uncommon. Gastropods have, however, PCL11-80-1) been the is within sub- the Shindachi Formation, a turbidite ject of works by Yokoyama (1890), Nagao (1930, facies 1932, of the 1939), Izumi Group, and the other six localities are all Nagao and Otatume (1938), and Matsumoto (1938), within resulting the basal part of the Azenotani Mudstone Member, which in the description of about 50 species. Hayami represents and Kase a marginal (1977) facies of the Izumi Group (Ichihara et al., summarized the basic information on these gastropods 1986). The sevenand localitiesre- in the Izumi Mountains area can be vised them preliminarily. Although these gastropods stratigraphically are rep- grouped into three horizons (Matsumoto and resentative of this age in Southeast Asia and include Morozumi, many 1980): in- A2 (NSM-PCL11-73-1, 11-73-3-11-73-5), teresting genera and species of importance in molluscan B3 (NSM-PCL11-80-1), and B5 (NSM-PCL11-73-2, 11-73-6). phylogeny, classification, and paleobiogeography, they have re- Recent study of ammonites from the Awaji Island area has shown that Horizon A2 is within the Nostoceras hetonaiense ceived little attention. Shells of the species described are poorly preserved and their features are often incompletely known, mak- Zone (earliest Maastrichtian) and Horizons B3 and B5 are some- ing difficult the confident allocation of these gastropods to their where near the Pachydiscus sp. aff. P. subcompressus Zone (early generic (sometimes familial) positions and their close compar- Maastrichtian), respectively (Morozumi, 1985). The discrete isons to those from other areas outside Japan. Thus, knowledge single occurrence at Loc. NSM-PC113-22-1 in the Awaji Island of the Late Cretaceous gastropods in Japan is still imperfect. area is within the Seidan Formation, which is within the Di- The Izumi Group in Southwest Japan has yielded exception- dymoceras awajiense Zone (Late Campanian) (Morozumi, 1985). ally diverse gastropods. Even in this group, however, the gas- Detailed locality descriptions are listed in the appendix. tropods are very rare and commonly can only be extracted with considerable effort owing to the nature and lithology of the IZUMI GASTROPOD FAUNA exposures. Most of the specimens described herein were ob- Close molluscan faunal similarity between the northwestern tained through the efforts of M. Tani, M. Sato, and T. Nishioka Pacific and North American Pacific Coast areas in the Late of Osaka City, S. Inoue of Kobe City, A. Nakamura of Kochi Cretaceous has long been recognized among ammonites (Matsu- University, and A. Matsuoka of Niigata University. Other spec- moto, 1960; Matsumoto in Bando et al., 1987), bivalves (Kauff- imens are from collections of the Osaka Museum of Natural man, 1973), and gastropods (Sohl, 1967). Kauffman (1973) has History, Osaka, or were collected by the author. A total indicated of 19 from his analysis of bivalves that these two areas are species has been discriminated; 11 species and two genera, biogeographically Tani- distinct from other areas and constitute the ella and Nipponitys, are described as new. These provide North new Pacific province, although they differ from each other at data characterizing the Late Cretaceous gastropod faunas the subprovincialof level. The degree of similarity differs in each Japan. taxonomic group. A number of ammonite species are common All described and figured specimens are housed in the between Section Japan and California in every age of the Late Creta- of Invertebrate Paleontology, National Science Museum, ceous Tokyo (Matsumoto, 1960), but faunal provincialism becomes (NSM-PM), the Osaka Museum of Natural History (OMNH), more distinct within the Campanian, probably due to the ap- and the British Museum (Natural History) (BM(NH)), London. pearance of fairly distinct climatic zonation in these areas (Mat- sumoto, 1984; Matsumoto in Bando et al., 1987). On the other AGE AND STRATIGRAPHY OF LOCALITIES hand, the provincialism of bivalves between these areas declined The Izumi Group is a thick marine sequence, mostly gradually of in tur-the Late Cretaceous (Kauffman, 1973). Aside from bidite origin, that consists of conglomerate, sandstone, inoceramids, and a number of bivalve genera are common between mudstone. It extends ENE-WSW in a narrow zone about 300 the the Japanese-East Asian and the Northeast Pacific sub- km long and 20 km wide along the northern border provincesof the in the North Pacific province, but no species have Median Tectonic Line from the Izumi Mountains to the western been found in common. The situation for gastropods seems to border of Shikoku. be nearly the same as for bivalves. 563 This content downloaded from 61.201.49.54 on Sun, 03 Feb 2019 01:42:27 UTC All use subject to https://about.jstor.org/terms 564 JOURNAL OF PALEONTOLOGY, V. 64, NO. 4, 1990 FIGURE I-Index map showing the fossil localities. Our knowledge of the Late Cretaceous gastropods from genus the Atira is widespread from southern California to Vancou- northern circum-Pacific areas is far more incomplete thanver Islandof and westward to Sakhalin and Japan (Sohl, 1969). other molluscan groups except for such taxonomic groups Atira as is the commonest gastropod from the Upper Yezo Group Biplica (Popenoe, 1957), Perissityidae (Popenoe and Saul, of1987; Hokkaido in Japan. The genus Ataphrus was widespread in Saul, 1988a), Tudiculidae and Melongenidae (Saul, 1988b), Tethyan and regions during the Jurassic and Early Cretaceous, but gyrodiform naticids (Popenoe et al., 1987). A considerable abruptly num- decreased from the beginning of the Late Cretaceous ber of species remains undescribed in Japan and California, onward. and Ataphrus compactus (Gabb) and A. crassus Gabb from previously described species are often ambiguous in shell the char- Upper Cretaceous of California and A. teshioensis Nagao acteristics, necessitating refinement of their generic and fromsubge- the Upper Yezo Group of Hokkaido are authentic Ata- neric (often familial) positions based on moder concepts. phrus. Thus, The genus Biplica is a characteristic genus in the Northern discussion of their faunal affinities remains premature. Pacific How- region. It is abundant in the Upper Cretaceous from ever, I give an account of the distribution of species and Albiangenera to Maastrichtian North American Pacific Coast deposits recorded from the Izumi Group in and outside Japan so and that extends southward to Chile and New Zealand (Popenoe, characteristics of the Izumi gastropod fauna may become 1957). avail- The Izumi Group has yielded two Biplica species, and able to other paleontologists. Of the 19 species discriminated Avellana problematica Nagao, 1932, from the Upper Yezo Group herein, 11 new species are at present restricted to the ofIzumi Hokkaido can be reassigned to Biplica. Avellana and Biplica Group. Pseudoperissitys bicarinata Nagao and Otatume
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