Occurrence of Late Permian Radiolarians from the Chituao Section, Laibin, Guangxi, China

Journal of Geosciences, Osaka City University Vol. 46, Art. 2, p. 13-23, March, 2003

Occurrence of Late Permian radiolarians from the Chituao section, Laibin, Guangxi, China

l l l KUWAHARA Kiyoko , YAO Akira , EZAKI Yoichi , 2 2 Lm Jianbo , HAO Weicheng and KUANG Guodun3

IDepartment of Geosciences, Graduate School of Science, Osaka City University, Osaka 558 8585, Japan 2Institute of Paleobiology and Environment, Peking University, Beijing 100871, P.R. China 3Guangxi Institute of Geology and Resources, Nanning, P.R. China

Abstract Late Permian (Wujiapingian - early Changxingian) radiolarians were detected from the Chituao sec tion, Laibin, Guangxi, China. The radiolarian assemblages have several species similar to those from Southwest Japan. The radiolarian assemblages are compared La the assemblages of the Follicucullus charveti - Albaillella yamakitai Zone and the Neoalbaillella ornithojormis Zone of Southwest Japan. Correlation of the Upper Permian strata between the Yangzi Platform of South China and the Mino Terrane of Southwest Japan is made by conodont and radiolarian zones. The occurrence of Follicucullus aff. whangaroaensis from the Chituao section suggests a paleogeographical similarity between the Yangzi Platform of South China and the Waipapa Terrane of New Zealand.

Key-words: Late Permian, Wujiapingian, radiolaria, conodont.

from the Dalong and Changxing formations, Guizhou 1. INTRODUCTION and Guangxi; Yu (1996) from the Wujiaping and Dalong formations, Lekang, Guizhou; Yang et al. (1997) from In the last several years, Upper Permian radiolar the Changxing Formation, Changxing, Zhejiang; Yao ian and conodont biostratigraphy has progressed in the and Kuwahara (1999a) from the Wujiaping and Dalong pelagic sediments of Japan. Kuwahara et al. (1998) con formations, Shangsi, Sichuan; Yao and Kuwahara firmed the Upper Permian radiolarian zones in bedded (1999b, 2000) from the Shaiwa Group and Dalong cherts of the Gujo-hachiman section, Mino Terrane, Formation, Ziyun and Luodian, Guizhou; Gao et al. Southwest Japan. Subsequently, Kuwahara (1999) (200 I) and Wang and Sheng (2001) from the Shaiwa de cribed several species of Late Permian Albaillella Group, Ziyun, Guizhou; Sheng et al. (200 I) from the and proposed their phylogenic lineages in the same sec Changxing Formation, Liuqiao, Guangxi. As a result of tion as Kuwahara et al. (1998). Moreover, Yao et al. these reports, the radiolarian faunal characters of the (2001) recognized six conodont interval zones in the platform region have been shown. However, the radi same section and correlated them with both the radio olarian assemblages were almost all reported from the larian zones and the conodont zones of South China. upper Upper Permian (Changxingian). Scarcity of On the other hand, Late Permian radiolarians from Wujiapingian radiolarian occurrences may be due to the the Yangzi Platform were reported from many localities lithological characteristics of the Wujiapingian of South as follows: Zhang et al. (1992) from the Dalong China. Formation, Hushan, Nanjing; Wang (1993) from the In this study, we report radiolarian fossils from the Kufeng Formation, Hushan, Nanjing; Yao et al. (1993) lower Upper Permian (Wujiapingian) of the Chituao sec- 14 Occurrence of Late Permian radiolarians from the Chituao section, Laibin, Guangxi, China

Upper Permian Dalong Formation, as discussed later. 2S'N

3. MATERIALS AND METHODS

Rock samples were collected for radiolarians from 55 horizons at the section, numbered from RI910 (low GUANGXI • Chituao section ermost) to RI964 (uppermost). The interval of each o Laibin horizon is from 90 em to 5 m (average 2.4 m), except in the middle part of the section, which includes the o Nanning manganese layers. The weight of each rock sample is several hundred grams. 22'N Rock samples were immersed in a 5% HF solution 10S'E 100km for 24 hours. Residues were collected using 35 and 200 Fig. 1 Index map of the Laibin area. mesh sieves. In some samples, only a few radiolarian fossils were obtained by one time HF treatment. To get enough fossils, the same treatment was conducted tion, Laibin area, Guangxi, China (Fig. 1). We corre repeatedly from several times to ten times at the maxi late the radiolarian assemblages with those of Southwest mum. Japan. Additionally we discuss the paleobiogeographi Microfossils, including radiolarians, foraminifera, cal significance of the radiolarian assemblages. sponge spicules, and ostracoda(?), were obtained from We use in this paper the spelling for Chinese stage the Chituao section. However, conodonts were not names and platform name, as Wujiapingian, Changxingian detected. Some foraminifera and sponge spicules and Yangzi, according to the Chinese Pinyin system. occurred sporadically in the lower part of the section (R1910-RI922). In middle part of the section (RI923- 2. GEOLOGIC SETTINGS

2.1 Geologic settings The studied area is located in Laibin City, Guangxi D Cenozoic Zhuang's Autonomous Region (Figs. I, 2), belonging D Cretaceous tectonically to the southwestern Yangzi Platform. The m Triassic § Permian Upper Paleozoic near Laibin is dominated by marine El Pre-Permian Fenghuang :::Cilituao section . carbonates with minor cherty and terrigenous clastic IT] faults intervals. The Middle to Upper Permian comprise the Maokou and the Gufeng formations and the Heshan and the Dalong formations, respectively. In the Laibin area, there is the Penglaitan section, which is a stratotype sec tion for the Lopingian, as mentioned in the later chap ter.

2.2 Explanation of studied section The studied section, named as the Chituao section, is located westward of Chituao hamlet, east of Fenghuang Village (Fig. 2). The section crops out along road-cuts with an east-west direction (Fig. 3). The strata consist mainly of gray to black bedded chert and siliceous mudstone, with manganese mudstone layers in the middle part of the section (Fig. 4). It strikes from NS to N20E, and dips about 60-70 degrees to east. The Fig. 2 Geological sketch map of the Lai bin area (based on the geologic map by Bureau of thickness of the section is 158 m. This section was pre Geology and Mineral Resources of Guangxi viously considered to the Gufeng Formation. The radi Zhuang Autonomous Region, 1985) showing olarians indicate that the section is correlated to the the location of the Chituao section. KUWAHARA Kiyoko, YAO Akira, EZAKI Yoichi, LIU Jianbo, HAO Weicheng and KUANG Guoclun 15

R1947), radiolarians, foraminifera, sponge spicules, and bipartitus, Follicucullus cf. charveti, Albaillella cf. ostracoda(?) appeared commonly. Especially, moder yamakitai, Albaillella cf. protolevis and Albaillella sp. ately preserved radiolarians occurred abundantly from G are important species for age determination. R 1935 to R 1943. In the upper part of the section The characteristics of representative samples are (R1948-RI964), sponge spicules increase markedly c1escri bed below. with small amounts of spherical radiolarian ghosts. R1923: Sample RI923 includes Follicucullus cf. charveti and Follicucullus cf. bipartitus. In spite of ten 4. RADIOLARIAN ASSEMBLAGES times HF treatment, we could obtain only one specimen for each species. The speci men, identified as Radiolarian fossils, which can be taxonomically Follicucullus cf. charveti (Plate I, fig. 6), shows the identified, are obtained from 14 samples (Fig. 5, Plates bulbous pseudothorax, which is characteristics of 1-2). Total 47 species are recognized through the sec Follicucullus charveti in a broad sense, although the tion. Up to 28 species are recognized in one sample. ventral spine is not preserved. The specimen of The radiolarian assemblage IS composed of Follicucullus cf. bipartitus (Plate I, fig.S) is rather Albaillellaria, Entactinaria, Latentifistularia and poorly preserved, but shows a curved apical cone. Spumellaria, although the classification of spherical R 1924: Though poor in preservation, it includes a radiolarians is debatable. The stratigraphic distribution few specimens of Follicucullus aff. whangaroaensis. of albailleJJarians is shown in Fig. 4. Follicucullus cf. The form of the shell is similar to FolLicucullus

Fig. 3 Photographs of the Chituao section, Laibin, Guangxi, China. I. Photograph of the lower part of the Chituao section. 2. Photograph of the upper part of the Chituao section. 3. Photograph of the outcrop showing the chert layers of the middle part of the Chituao section. 4. Close-up view of the outcrop showing black chert layer at sample Rl959. 16 Occurrence of Late Permian radiolarians from the Chituao section, Laibin, Guangxi, China

whangaroaensis but is different as mentioned below. R1938: The pre ervation and the abundance of radi Follicucullus whangaroaensis is originally described olarians are rather good in sample R1938. A lot of from a Late Permian limestone lens at Arrow Rocks in Albaillella sp. G occur in this horizon. Other common the Whangaroa Area within Waipapa Terrane, New species are Foremanhelena triangula, Ruzhencevispongus? Zealand (Takemura et aI., 1999). The type specimens sp. A, Entactinia itsukaichiensis, Hegleria sp. A, and have 240-330 ,lim in length of shell, and have two dis Orbiculiforma? sp. A. tinct inflated rings in the lower part. Present specimen from the Chituao section (Plate I, fig.7), has 430 ,lim R1941: One specimen of Albaillella cf. protole length of shell with no rings in the lower part. vis occu....ed in the sample R1941. It shows a smooth R 1937: Moderately preserved radiolarians occurred shell su ..face, which is a diagnostic character distin in R 1937. Follicucullus spp. are common, but they are guishing it f..om Albaillella yamakitai, Albaillella sp. often broken. Albaillella cf. yamakitai is characteristic G etc. Latelltifistula similicutis, Latentifistularia gen. of this horizon. In the figured specimen of Albaillella et sp. indet. A2, and Hegleria mammilla are com cf. yamakitai (Plate I, fig. 2), the ventral wing protrudes monly observed from this sample. in the middle part of the shell that resemble Albaillella R1943: The representative of sample RI943 yamakitai. The abundant species are Foremanhelena includes fshigau/11 trifustis, Raciditor cf. scalae, triangula, Raciditor scalae, and Entactinaria? gen. et sp. Copicyntra? sp. A, Hegleria sp. B, Spongotripus? sp. indet. A with four radial spines. A etc. Albaillellarians are not detected from this sam ple. Based on these composition, the radiolarian assem

.!!) blage from R 1923 to R 1938 is compared to the Follicucullus U) c: charveti -Albaillella yamakitai Assemblage, and the '"<1l U) 2 :::> <1l assemblage of R 1941 may be compared to the ."'= ~ 0> t:: c: _Mnlayers ~ <1l 's <1l .c: ~ .!!! Neoalbaillella ornithoformis Assemblage of SW Japan .9- .c:<1l ;: <1l chert and .Q :::> lJ) R1964 :§ :::> :::> :::> ~ ~ .!!! :::> :::> :::> ~ .!!! ~ 5. DISCUSSIO

R1935 tolevis herein observed may indicate the lower part of R1934 the Neoalbaillella ornithoformis Assemblage Zone. R1933 Ishiga and Miyamoto (1986) reported the R1929 Follicucullus bipartitus - Follicucu/lus charveti

R1924 Assemblage from the fusulinacean Lepidolina kumaen R1923 sis Zone of the Kuma Formation, Southwest Japan. The 20m Lepidolina kumaensis Zone was settled to the lower part of Wujiapingian (Ishii, J990). The Follicucullus bipar titus - Follicucullus charveti Assemblage Zone of Ishiga

R1910 (J 990) is equivalent to the Follicucullus charveti Fig. 4 Coluilln of the Chituao section with saillpling Albaillella yamakitai Assemblage Zone of Kuwahara et horizons and selected radiolarian occurrences. al. (1998), which is considered to correspond to the KUWAHARA Kiyoko, YAO Akira, EZAKI Yoichi, LJU Jianbo, HAO Weicheng and KUANG Guodun 17

M V en .,.,

Fig. 5 Occurrences of radiolarians in the Chituao section. 18 Occurrence of Late Permian radiolarians from the Chituao section, Laibin, Guangxi, China

South China SW Japan SW Japan Conodont zone Conodont zone Radiolarian zone This study (Mei and Shi, 1999) (Yao et al.,2001) (Kuwahara et al., 1998) Neoalbaillella Clarkina Clarkina :a .~ optima "0 O!l changxingensis parasubcarinata ------~ .5 I >< ... O!l eu c:: Neoalbaillella (\:l C. subcarinata Neoalbaillella ~ 3: C. subcarinata -c. wangi ornithoformis ornithoformis S@ .sO 0::: ------~ C. inflecta ~ Follicuculls Follicuculls ...eu c: 0::: o.~ ~ 0. .- charveti charveti ~ ~ ~ C. orientalis C. orientalis -Albaillella -Albaillella ~ ~ '0.. ~ ~ yamakitai yamakitai -"0 .-...... Fig. 6 Correlation of radio •_ ::I C. transcaucasia C. liangshanensis ------:E:s Follicuculls larian and conodont scholasticus zones in the Upper - F. ventricosus Permian.

Wujiapingian. tion includes Follieueullus aff. whangaroaensis. The correlation between radiolarian zones and con Follieucullus whangaroaensis occurs abundantly from a odont zones was made by Yao et al. (2001) in the limestone lens at the Arrow Rocks in the Waipapa Gujo-hachiman ection, Mino Terrane, Southwest Terrane, New Zealand, but it ha not yet been found Japan. The Follieueullus charveti - Albaillella yama from Japan. However, the specimen of Follicucullu kitai Assemblage Zone is correlated to the Clarkina aff. whangaroaensis from the Chituao section shows liangshanensis and Clarkina orientalis conodont zones. some morphologic difference compared with the type The Neoalbaillella ornithoformis Assemblage Zone specimen of Follicucullus whangaroaensis as mentioned roughly corresponds to the Clarkina subcarinata Zone. before, although the similar shell form may give pale These conodont zones were correlated to those of South ogeographic implications. China also. Therefore, Chinese conodont zones and In the paleogeographic reconstruction during late Japanese radiolarian zones can be correlatable (Fig. 6). Permian time, the Yangzi Platform was located at the On the basis of the above-mentioned correlation low latitude area between Paleo - Tethys and Panthalassa between the radiolarian and conodont zones, the age of (e.g., Wu, 1999). The Permian in the Waipapa Terran , the Follieueullus eharveti - A lbailiella yamakitai New Zealand, containing Follicueullus whangaroaensis, Assemblage Zone is late Wujiapingian. The age of the is considered to originate in a low -latitude area Neoalbaillella ornithoformis Assemblage Zone is latest (Takemura et aI., 1999). On the other hand, Wujiapingian? to early Changxingian. Follieucullus whangaroaensis has not b n found from The Chituao section was previously considered to the Upper Permian chert facies of the Mino Terrane of the Gufeng Formation of Middle Permian age. This Southwest Japan. It is considered that these Japanese study indicates that the Chituao section is the Upper Permian of the Mino Terrane was originally deposit d Permian. Based on their geologic age, the Chituao sec in the low -latitude area in the Panthala a. So thi tion could be correlated to the Dalong Formation, apart Follieucullus whangaroaensis could be a key to suggest from the Gufeng Formation. paleogeographical differences between Paleo - Tethy According to Jin et al. (1998), the Maokou and the and Panthalassa within the same low-latitude area. Heshan formations crop out at the Penglaitan section It is remarked that the studied radiolarian assem near Laibin (Fig. 2). These strata have been well inves blages are generally compared to the Japanese Late tigated as the stratotype section for the Lopingian. The Permian radiolarian assemblages a illustrated by Upper Permian He han Formation, 150 m in thickness, Kuwahara and Yao (2001). However, the studied radi is composed of limestone, chert and mudstone. The olarian as emblages comprise only of several to 28 Chituao section hould not be assigned to the Heshan specie at the maximum per one sample. This specific Formation lithologically irrespective of the same age. number i rather small, compared with those from the chert sample of Southwest Japan, which ordinarily 5.2 Paleogeographic view and further problems includes about 100 species. The difference in specific The radiolarian assemblage from the Chituao ec- number could be merely due to the difference in fos il KUWAHARA Kiyoko, YAO Akira, EZAKI Yoichi, LIU Jianbo, HAO Weicheng and KUANG Guodun 19

preservation, but there is some possibility that it reflects Ezaki Y., Hao W. and Wang X. (eds.) : Biotic and the original faunal difference between the Yangzi Gelogical Development of the Paleo-Tethys in Platform and Southwest Japan. China, Peking University Press, 113-122. Sheng Q., Caridroit, M. and Wang Y. (2001) Radiolarians Acknowledgements from the Uppermost Permian Changhsingian of Southern Guangxi. Acta Micropalaeontol. Sinica, To take the photomicrographs of radiolarians, we 18, 3, 229 -240. used SEM (JSM-5500) with kind help of Dr. Okudaira Takemura A., Morimoto T., Aita Y., Hori R. S., Higuchi Takamoto, Osaka City University. Y., Sporli, B. K., Campbell, H. J., Kodama K., Sakai T. (1999) Permian Albaillellaria (Radiolaria) References from a limestone lens at the arrow rocks in the Waipapa Terrane (Northland, New Zealand). Bureau of Geology and Mineral Resources of Guangxi Geodiversitas, 21, 4, 751-765. Zhuang Autonomous Region (1985) Regional Wang Y. and Sheng Q. (2001) Discovery of the Geology of Guangxi Zhuang Autonomous Region. Neoalbaillella radiolarian fauna in the Shaiwa Group People s Republic of China, Ministry of Geology of Ziyun district, Guizhou. Acta Micropalaeontol. and Mineral Resources, Geological Memoirs, ser. Sinica, 18, 2, 111- 121. 1, no. 3, 853pp. (in Chinese with English abstract) Wang R. (1993) Fossil radiolarians from the Kufeng Gao Y., Yang F. and Peng Y. (2001) Late Permian deep Formation, Hushan area, Nanjing. Acta water stratigraphy in Shaiwa of Ziyun, Guizhou. Micropapaeontol. Sinica, 10,4,459-468. (in Chinese Jour. Stratigraphy, 25, 116-119&124. with English abstract) Ishiga H. (1990) Paleozoic radiolarians. In : Ichikawa Wu H. (1999) Implications of radiolarian chert for the K., Mizutani S., Hara 1., Hada S. and Yao A. (eds.) palaeogeography of South China. Jour. Palaeogeography, : Pre Cretaceous Terranes of Japan, Nippon Insatsu 1, 2, 28-35. (in Chinese with English abstract) Shuppan Co. Ltd., 285-295. Yang M., Li J., Li H., Chen H., and He H. (1997) Ishiga H. and Miyamoto T. (1986) Follicucullus Radiolarian fossils from the Changxing Formation (Radiolaria) from the Upper Permian Kuma at Changxing, Zhejiang Province and their facieo Formation, Kyushu, Southwest Japan. Trans Proc. logical significances. Scientia Geologica Sinica, 32, Soc. Japan, N.S., No. 141, 322-335. 2, 229-232. (in Chinese with English abstract) Ishii K. (1990) Provinciality of some fusulinacean fau Yao A., Yu J. and An T. (1993) Late Paleozojc radio nas of Japan. In : Ichikawa K., Mizutani S., Hara larians from the Guizhou and Guangxi areas, China. 1., Hada S. and Yao A. (eds.) : Pre Cretaceous Jour. Geosci., Osaka City Univ., 36, 1-13. Terranes of Japan, Nippon Insatsu Shuppan Co. Yao A. and Kuwahara K. (1999a) Middle-Late Permian Ltd., 297-305. Radiolarians from the Guangyuan -Shangsi area, Jin Y., Mei S., Wang W., Wang X., Shen S., Shang Q. Sichuan Province, China. Jour Geosci., Osaka City and Chen Z. (1998) On the Lopingian Series of the Univ., 42, 69-83. Permian System. Palaeoworld, No.9, 1-18. Yao A. and Kuwahara K. (1999b) Permian and Tdassic Kuwahara K. (1999) Phylogenetic lineage of Late radiolarian assemblages from the Yangzi Platform. Permian Albaillella (Albaillellaria, Radiolaria). In : Yao A., Ezaki Y., Hao W. and Wang X. (eds.) Jour. Geosci., Osaka City Univ., 42, 85 -101. : Biotic and Gelogical Development of the Paleo Kuwahara K. and Yao A. (2001) Late Permian radio Tethys in China, Peking University Press, 1-: 16. larian faunal change in bedded chert of the Mino Yao A. and Kuwahara K. (2000) Permian and Triassic Belt, Japan. News of Osaka Micropaleontologists, radiolarians from the southern Guizhou Province, Spec. Vol., No. 12, 33-49. (in Japanese with China. Jour. Geosci., Osaka City Univ., 43, 1-19. English abstract) Yao J., Yao A. and Kuwahara K. (2001) Upper Permian Kuwahara K., Yao A. and Yamakita S. (1998) biostratigraphic correlation between conodont and Reexamination of Upper Permian radiolarian bio radiolarian zones in the Tamba - Mino Terrane, stratigraphy. Earth Science (Chikyu Kagaku), 52, Southwest Japan. Jour. Geosci., Osaka City Univ., 391-404. 44,97-119. Mei S. and Shi X. (1999) On evolution and zonation of Yu J. (1996) Permian radiolarian biostratigraphy in the Permian and Early Triassic conodonts. In : Yao A., Guizhou area, China. Jour. Geosci., Osaka City 20 Occurrence of Late Permian radiolarians from the Chituao section, Laibin, Guangxi, China

Univ., 39, 123-135. Nanjing and their facieological significance. Earth Zhang K., Wu S. and Liu Y. (1992) Radiolarians and Sci. - Jour. China Univ. Geosci., 17, 3, 295-300. conodonts from the Dalong Formation at Hushan of (in Chinese with English abstract)

Manuscript received September 5, 2002. Revised manuscript accepted January 29, 2003.

Plate 1. Scanning photomicrographs of Late Permian radiolarians from the Chituao section, Laibin, Guangxi, China.

Fig. I. Albaillella cf. protolevis Kuwahara, from R 1941 Fig. 2. Albaillella cf. yamakitai Kuwahara, from R1937 Fig. 3. Albaillella sp. G of Kuwahara (1999), from R1938 Fig. 4. Albaillella sp. G of Kuwahara (1999), from R 1938 Fig. 5. Follicucullus cf. bipartitus Caridroit & DeWever, from R 1923 Fig. 6. Follicucullus cf. charveti Caridroit & DeWever, from RI923 Fig. 7. Follicucullus aff. whangaroaensis Takemura, from R) 924 Fig. 8. Follicucullus sp., from R 1937 Fig. 9. Follicucullus sp., from R1937 Fig. 10. Follicucullus sp., from R1941 Fig. II. Copicyntra? sp. A, from R1938 Fig. 12. Copicyntra? sp. A2, from R 1943 Fig. 13. Copicyntra? sp. B, from R 1938 Fig. 14. Copicyntroides sp. A, from R 1937 Fig. 15. Copiellintra? sp. A, from R 1943 Fig. 16. Copiellintra? sp. B, from R1938 Fig. 17. Entactinia itsukaichiensis Sashida & Tonishi, from R 1938 Fig. 18. Entactinosphaera? crassispinosa Sashida & Tonishi, from R1938 Fig. 19. Hegleria mammilla (Sheng & Wang), from RI943 Fig. 20. Hegleria sp. A, from R 1938 Fig. 21. Hegleria sp. B, from R 1943 Fig. 22. Meschedea permica Sashida & Tonishi, from R1943 Fig. 23. Meschedea? sp. A, from R 1938 Fig. 24. Triaenosphaera minutus Sashida & Tonishi, from R1938 Fig. 25. Entactinaria? gen. et sp. indet. A, from R 1943 Fig. 26. Entactinaria? gen. et sp. indet. B, from R 1938 Fig. 27. Entactinaria gen. et sp. indet. C, from R 1941 Fig. 28. Entactinaria? gen. et sp. indet. D, from R 1941 Fig. 29. Entactinaria? gen. et sp. indet. E, from R1941 KUWAHARA Kiyoko, YAO Akira, EZAKI Yoichi, Liu Jianbo, HAO Weicheng and KUANG Guodun 21

Plate 1 22 Occurrence of Late Permian radiolarians from the Chituao section, Laibin, Guangxi, China

Plate 2. Scanning photomicrographs of Late Permian radiolarians from the Chituao section, Laibin, Guangxi, China.

Fig. 1. Foremanhelena triangula DeWever & Caridroit, from R 1937 Fig. 2. Gustefana obliqueannulata Kozur, from R 1941 Fig. 3. Gustefana sp., from R1941 Fig. 4. lshigaum trifustis DeWever & Caridroit, frol11 R1943

Fig. 5. Latentifistula similicutis Caridroi t & DeWever, frol11 R J941 Fig. 6. Latentifistula? sp. A, from R 1937 Fig. 7. Latentifistula sp. B, from R 1943 Fig. 8. Latentifistula sp. C, from R 1938 Fig. 9. Latentifistula sp. D, from R 1938 Fig. 10. Ormistonella robusta DeWever & Caridroit, from RI938 Fig. I I. Raciditor gracilis (DeWever & Caridroit), frol11 R1943 Fig. 12. Raciditor il1flata (Sash ida & Tonishi), frol11 R 1941 Fig. 13. Raciditor cf. scalae (Caridroit & DeWever), frol11 R 1938 Fig. 14. Ruzhencevispongus? sp. A, frol11 R1938 Fig. 15. Tormentum sp. A, from R 1937 Fig. 16. Latentifistlliaria? gen. et sp. indet. A, from RI937 Fig. 17. Latentifistlliaria? gen. et sp. incler. A2, frol11 R1941 Fig. 18. Latentifistularia? gen. et sp. incler. B, frol11 R1938 Fig. 19. Latentifistlliaria? gen. et sp. indet. C, frol11 RI938 Fig. 20. Grandetortura? sp. A, from R 1938 Fig. 21. Orbiculiforma? sp. A, frol11 R 1938 Fig. 22. Spongotripus? sp. A, frol11 R 1943 Fig. 23. Spllmellaria gen. et sp. indet. A, frol11 RI937 KUWAHARA Kiyoko, YAO Akira, EZAKI Yoichi, LIU Jianbo, HAO Weicheng and KUANG GlIodlin 23

Plate 2