CARBONIFEROUS PLANTS PERU 13 



Shale i 



Gray arkosic sandstone 5 



Sandy shale 18 



Thin-bedded sandstone and sandy shale with more massive sand- 

 stone at base 70 



Dark carbonaceous shale with 2 to 3 inches of coal at top, abun- 

 dantly fossiliferous (N. 5 E, 25 E) (tunnel) 18 



Massive greenish sandstone 15 



Sandy shale 13 



Pleistocene Total 585 



Section repeated by faulting to the southwest. 



The materials are relatively coarse throughout and would 

 seem to indicate rapid deposition. Between 53 and 54 per 

 cent of the total thickness is described as sandstone, which 

 is often coarse and arkosic. Of the 273 feet described as 

 shale 192 feet is distinctly sandy, so that less than 14 per cent 

 of the total thickness, including the so-called coal seams, is 

 fine grained shale and even the coal contains much silty im- 

 purities. No underclays with rootlets, or upright stems were 

 observed and the coaly layers have every appearance of hav- 

 ing been formed of drift material, which also appears to 

 have been the case in the probably contemporaneous and very 

 similar continental Carboniferous examined on the Copaca- 

 banya Peninsula on Lake Titicaca in Bolivia. 

 AGE OF THE FLORA 



The flora comprises the following forms : 



1. Palmatopteris furcata (Brongn.). 



2. Eremopteris whitei Berry. 



3. Eremopteris peruianus Berry. 

 Arthrophyta Calamariaceae. 



4. Calamites suckowii Brongn. 



5. Calamostachys sp. 



Lepidophyta Lepidodendrales Lepidodendracere. 



6. Lepidodendron rimosum Sternb. 



7. Lepidodendron obovatum Sternb. 



8. Lepidophyllum sp. 



9. Lepidostrobus sp. 



10. Stigmaria sp. 



11. Knorria sp. 



