﻿I860.] 



FORBES BOLIVIA AND PERU. 



55 



sented in this section are several beds of a quartzitic sandstone, 

 which again are followed by the strata coloured as Devonian. The 

 beds enumerated in the annexed table are numbered from W. to E., 

 or in descending order, commencing with the highest : — 



1 . Thick blue clay-shales 



2, 



Brown micaceous slates. Strike N. 5° W. 

 Dip 50° W 



3. Blue, hard, and slightly micaceous beds 



4. Less laminated micaceous beds 



5. Blue clay-shales 



6. Blackish-blue shattered clay-shales ... 



7. Thin bed, about 6 inches of slightly 



calcareous shales 



8. Shattered blue shales of great thickness 



9. Thin blue slates at Hacienda de Mille- 



paya, much jointed 



No fossils found. 



Annelid-burrows, some globular 

 bodies, and a fossil supposed by 

 ■{ Mr. Salter to be a Cruziana ; 



also a curious Patella or Pile- 

 [ opsis. 

 Orthis Aymara. 



' No fossils found, 



10. Slightly micaceous blue beds 



11. Siliceous grauwacke sandstone beds, 



about 100 feet thick 



12. Thin shales 



13. Grauwacke, thin bed, sandy 



14. Thin shales 



15. Grauwacke 



16. Thin shales 



17. Grauwacke 



18. Thin shales 



19. Grauwacke 



20. Clay-slate, dirty-blue colour 



21. Thin-bedded micaceous clay-slate 



22. Bluish slates 



23. Thin grauwacke 



24. Clay-slate 



25. Thick grauwacke-slates 



26. Rather hard, greyish-blue, sandy shales 



27. Clay-slates 



28. Grauwacke-slates 



29. Hardened clay-slates 



30. Whitish grey, hard grauwacke-slates, or 



sandy shales 



31. Grauwacke bed 



32. Micaceous clay-slates 



33. Blue siliceous clay -slate, or more or less 

 sandy shale; weathering white on the 

 surface 



1 Orthis with fine strirc. Orthis 

 Aymara, Cruziana Cucurbita, An- 

 nelid-burrows, and several indi- 

 stinct bodies. 



► No fossils found. 



I 



; 



Annelid-burrows, 

 \ No fossils found. 



f Orthis Aymara, Worm-burrows, 

 [ Ctenodonta (Nucula). 



No fossils found. 



34. Hard, white, altered clay-slates, cut 

 through by metallic veins 



j- Homalonoius (new species). 



No fossil found. 

 Annelid-burrows. 



( Orthis Aymara, Phacops, Proe- 

 tus, Cucullella, Ctenodonta (Nu- 

 cttla), Area Urownii, BeUerophon, 

 Tentaculites Saienzii, Baphisto- 

 \ma?, Homalonotus Linares, An- 

 nelids, and several other fossils, 

 indistinct. This bed seemed to 

 abound in the above-mentioned 

 fossils. 



No fossils found. 



