THE LARGER FAUNAL HORIZONS. 



India [Reed, 1910, p. 66], taken with the occurrence of fragments of the 

 fauna in Siberia in the valleys of the Lena, Yenisei, and Angara [von Toll, 

 1899], indicates something of the extent of the Middle Cambrian sea. The 

 larger area outlined by Willis in which Cambrian rocks are supposed to occur 

 is probably much too small, as later rocks undoubtedly conceal large areas 

 of the Cambrian. 



The prevalence of limestones with interbedded calcareous and argilla- 

 ceous shales indicates relatively shallow seas and favorable environment for 

 the life of the sea. This inference is supported by the number of genera and 

 species already found in the hurried collecting necessitated by the conditions 

 of exploration met with by the Willis and Iddings parties. 



In the Ch'ang-hia District the Middle Cambrian is represented in 

 the Ch'ang-hia limestone, in the Sin-t'ai district by the lower portion of 

 the Kiu-lung limestone, and in Shan-si by the lower 400 feet (118 m.) of the 

 Ki-chou limestone. 



The lower portion of the Kiu-lung group lower limestone contains the 

 following fauna: 



Globigerina ? mantoensis (5) 



Coscinocyathus clvira (075) 



Micromitra (Paterina) labradorica oricntalis (Cg) 



Micromitra (Ipliidella) pannula ophirensis 



Obolus damesi (Cj) 



Obolus obscunis (63, Cys) 



Lingulella (Lingulepis) eras (Cy) 



Eoorthis agreste (C 28) 



Eoorthis kichoucnsis (075) 



Acrotrcta pacifica (Cs) 



Acrothele rara (023) 



Orthotheca daulis (023) 



Scendla ? dilatatus (Cyo) 



Helcionella ? ? simplex (C 70) 



Redllchia finalis (58) 



Ptychoparia impar var. (C8) 



Ptychoparia lilla (C 75) 



Ptychoparia tolus (052) 



Ptychoparia sp. (058) 



Ptychoparia (Emmrichella) eriopia (023) 



Ptychoparia (Emmrichella} theano (023) 



Conokephalina maia (Cjo) 



Conokephalina sp. (C 70) 



Inouyia abaris (C7, Cg) 



Inonyia armata (075) 



Inou\ia capax 

 Inouyia divi 

 Inouyia indie (C 70, 75) 

 Inouyia tliisbc (28) 

 Inouyia titiana (7) 

 Agraulos abrota (023) 

 Agraulos dirce (052) 

 Agraulos dolon (Cj) 

 Agraulos nitida (075) 

 Agraulos uta (75) 

 Agraulos vicina (Cjo) 

 Anomocare latdimbatum (052) 

 Anomocare minus (Cg] 

 Anomocare sp. (Cs) 

 Anomocare sp. undt. (C8) 

 Anomocardla butes (Cs, 052) 

 Anomocarella subrugosa (Cj) 

 Anomocardla tatian (023) 

 Anomocardla tcnes (C28) 

 Anomocardla thraso (Cj) 

 Anomocardla toxeus (28) 

 Coosia decelus (Cg) 

 Dolichometopus ? sp. (Cs) 

 Bathyuriscus ? sp. (C28) 



Of the above fauna only three species pass into the strata above. One 

 is Obolus damesi, which occurs a little higher in the limestone beneath the 

 horizon of the Ku-shan shale, and it has a possible representative in the upper 

 part of the Upper Cambrian. Inouyia melie Walcott and I. divi Walcott 

 are found in the strata a little higher in the section. 



