(I) 10 



Palssontologia Sinica 



Ser. B 



Shales and sLaly limestones, yellowish gray to violet... 



Brownish and red limestone conglomerate 



Platey limestone 



Interstratified sill 



Shales and shaly limestones 



Ijimestone 



Brown shales and calcai'enytes 



Brownish-red limestone C(jnEl()nicrate 



Pciltiif-.c format ion (exposed) 



Oolitic limest(_me 



Bluish hlack massive limestone with fossil horizons F2, 10 meters and Fl, 



oo meters below tlie top 



Base not exposed 



525 m. 



ToUd exposed tliiclciir>^s of Ordovician 



The most significant fact revealed l>y the study of this section is the ahsence of 

 the IMachiakou or Actinoceras limestone, which over such a wide area directly underlies 

 the Carhoniferous formations. This indicates a very pronounced pre-Carhoniferous 

 erosion in this region and further, a marked irregularity of attitude of the Ordovician 

 strata, for a short distance to the south the higher limestones are present, and they are 

 again found furtlier to the north in Manchuria. 



Peilintze Li.mestone. — A note^\■orth3' fact is the apparent entire distinctness 

 of the two faunas found in the limestorn'S of this section. Tlie fauna of the lower or 

 PeiVintze Jiviestonc at preseiit comprises tlie following species: 



ACTINOZOA (?) 



1 Arcli;roci/at}ni,>< {ArfJiivoyci/pli in) rJiihlicin'r (Jrahau 

 GASTROPODA 



2 (Jphilefn s(jii,iimos(A (h'al)au 

 o Ftisii^pird sp. 



CEPHALOPODA 



4 Pivfocnmcrorrras vmttliieiii (Jrahau 



5 Cliihlioccrax natliani Grahau 



G CliiJdioccrns diingirarujinocnsr Grahau 

 ? 7 Piloceras plafijrnilnun Graliau (doubtful from this horizon). 



Tlie presence of Archivocyatlvii.^ in this fauna is notCAVorthy. This gcnns, and 

 indeed all of the Arclnroci/ddiimr, are typical of Ganilman horizons, occurring most 



