Garhoniferous Fossils from Siam. 177 



Chonetes cf. rectispina Von Koenen. 

 ;, aff. buchiana De Kon. 

 sp. 

 Proetus cf. coddonensis Woodw. 

 Phillipsia a£E. silesiaca Scupin. 

 Cythere (?) sp. 



Cladochonus cf. Michelini (Edw. & Haime). 

 Crinoid stems. 



Conclusions. 



In 1913 Mr. J. B. Scrivenor ' referred to the above described 

 collection of Siamese fossils as probably belonging to his " Raub 

 Series ", which he regarded as of Carboniferous and Pernio- 

 Carboniferous age, and a specimen of the fine-grained fossiliferous 

 shale, which I sent for his inspection in 1916, was pronounced as 

 resembling " weathered decalcified shale " of this series. We are 

 unfortunately without any knowledge of the field-relations of the 

 Patalung rocks, but the occurrence of beds of Carboniferous age 

 in other parts of South-Eastern Asia, the East Indies, and China 

 is well established. Since Scrivenor (oj). cit.) gave a list of references 

 to most of the literature, the important work of MM. Mansuy and 

 Deprat ^ has appeared on Annam, Tonkin, and Yunnan, while 

 Fliegel's ^ memoir should also not be forgotten in addition to those 

 by Schellwien and Loczy, which have been quoted in the fore- 

 going papers. Hogbom's '^ recent summary of the geology of Siam 

 does not deal with the Patalung region, and no fauna of a similar 

 type is mentioned as occurring elsewhere in the country. The whole 

 facies of the fauna is undoubtedly that of the Culm, and several of 

 the species seem to be identical or very closely comparable 

 with species occurring in beds of this age on the Continent and in 

 the south-west of England. A remarkable lithological similarity 

 is noticeable between these Siamese beds and those of Coddon Hill, 

 near Barnstaj)le,^ and the state of preservation of the fossils is 

 practically identical, though no radiolaria have been so far discovered 

 in the former. The species of Posidonomya, moreover, is scarcely 

 separable from the typical Culm form, P. Becheri. 



It is not possible to detect any f aunistic resemblance to the Permo- 

 Carboniferous or Productus Limestones of India and other parts of 

 Asia, and the whole palaeontological evidence appears to point to 

 a reference of the beds to an older set of deposits, and to prove the 

 occurrence of Culm conditions and a Culm fauna in this part 

 of Siam. 



^ Scrivenor, Quart. Journ. Geol. Soc, vol Ixix, 1913, p. 352. 



2 Mansuy & Deprat, Mem. Serv. Geol. Indo-chine, vol. i, fasc. iiand iv, 1912 j 

 vol. ii, fasc. iii and iv, 1913. 



^ Fliegel, Palceontographica, Bd. xlviii, 1901, pp. 91-136, t. vi-viii. 



* B. Hogbom, Bull. Geol. Inst. Univ. Upsala, vol. xii, 1913-14, pp. 63-128, 

 map, pi. i. 



'' G. J. Hinde & H. Fox, Quart. Journ. Geol. Soc, vol. Ii, 1895, pp. 609-68, 

 pis. xxiii-xxviii. 



VOL. LVII. — NO. IV. 12 



