ox SOME CRETACEOUS FOSSILS FKOM SHIKOKU. 359 



tioii seems to consist solely of sandstone which is us usual frey to 

 greyish-green, fine-grained and hard. It c(3ntains Trigonia pocilli- 

 foiviis and Tr. KikucJiiana in tolerable abundance. Besides, it yields 

 remains of many ether Lamellibranchs, some Gasteropods and Echi- 

 noids, whose preservation, however, is very imperfect. The rock at 

 Okuminodani directly overlies the Upper Jurassic C'idaris- Limestone. 



Lastly, the Sakaiva Basin is situated in Takaoka-g<)ri of the same 

 province, alj(jut 40 Km to the west of Kyöseki. Wliat is kncjwn of it 

 we ow^e to the investigations of Messrs Xaumann^' and Xasa,--' the 

 latter of wdiom planned the geological map"^^ of the district. 



The Cretaceous Formation of Saknwa is wholly composed of 

 sandstone, wdiich is quite similar to that of Hyôseki. On the south of 

 the town of Sakawa, it lies partly on the Cidaris-Limcstone, and 

 partly on a series of shales and sandstone, w'hich at Yoshida-Yashiki 

 yields some plants.^^ Xear Ochi, however, it seems to overlie directly 

 the Triassic sandstone of the district. 



Besides Alectryonia, Lucina, Xucula, ISolen, Khynclionella and a 

 Scaphites-like Ammonite, Trigonia pociUiforniis Tr. Kikucliiana, and 

 Tr. rutundata were also obtained from the above sandstone. 



From what has been said above, it will be seen that tlie number 

 of fossil species in the Shikoku Cretaceous is rather small ; and these, 

 moreover, are so imperfectly preserved that the majority of them are 

 indeterminable. On this account, I can describe only four species 

 in this paper, 'iliese four, however, are very important, as some of 

 them not only show the undoubted Cretaceous age of the strata con- 

 taining them, but at the same time, they give lis the probability that 



1) Naumann u. Xeumajr. Zur Geoloiyie ii. Paläoiitohtjie von Jap'm. Dcnks. d. math.-natûrw. 

 Classe d. K. Akad. d. Wissens., JVien, BX. LVll, 1890. 



2) T. Nasa. lîejMrt. of Geol. Sure, of Saliawa)iiu]\i, Tosa^ 1SS5 (MS). 



3) Given in Harada's Japanischen Inseln, 1. c. 



•i) Nithorst considers these plants as Upper Jurassic. Vide Beitr. i. Mesoz. Flora Jaj^ans. 

 Denks. d. Mith.-Nat. CI. d. K. Akid. d. Wissen.;. Wien, Bd. LVII, 1890. 



