38 



ME. J. A. DOUGLAS 01S T GEOLOGICAL SECTIONS [April 1914* 



and a lower or ' Icla-Schiefer,' corresponding to the Helderberg 

 Series. The further subdivisions with their characteristic fossils- 

 are shown in the accompanying table. 



North. America. 



Bolivia. 



| 



Hamilton 

 Group. 



Hamilton 

 Shales. 



Humapampa Sandstone. 



[ 



Ifarcellus 

 Shales. 



1 



f Conularia Shales and con- 

 ;g cretionary limestones. 



^ . 



^v Upper 



\ Helderberg 

 \ Series. 



Oriskany \^ 

 Sandstone. \^ 



\ 



Corniferous 

 Limestone. 



Schoharie Grit. |« 



5 j§ Calcareous sandstones with 



1 ^ ^ Liorhynchus bodenbenderi j 



- ss and Leptocoelia acutiplicata.l 



Caudagalli Gi*it. ! 





Lower Helderberg 

 Group. 





°9 



hh Sandstones with Scaphio- 

 ccelia boliviensis. 



The fossils recorded from Coniri, though few in number, are 

 sufficient to assign the beds to the lower part of the 'Icla-Schiefer' : 

 the upper beds of concretionary limestones and shales with Conu- 

 laria, which are abundantly developed farther north in the Puno 

 district, being absent or unexposed in this region. 



Faunae List. 



Scaphioccelia boliviensis Whitfield. 

 Schizophoria sp. 



Liorhynchus bodenbenderi Kayser. 

 Leptoccelia actttiplicata (Conrad). 

 Leptoccelia flabellites (Conrad). 



No evidence has yet been obtained of the existence of Upper 

 Devonian rocks postulated by Forbes. 1 



Palseontological Notes. 



Liorhynchus bodekbejN'deet Kayser. 



The shells referred to this species, though occurring chiefly in the 

 form of casts, are almost identical in appearance with those figured 

 by Prof. E. Kayser 2 and by Dr. Ivor Thomas. 3 



The latter author, comparing the Bolivian with the North - 



1 Q. J. G. S. vol. xvii (1861) p. 52. 



2 Zeitschr. Deutsch. Geol. Gesellsch. vol. xlix (1897) p. 292 & pi. viii, 

 figs. 1-10. 



3 Ibid. vol. lvii (1905) p. 265 & pi. xiv, fig-s. 31-34. 



