212 Annals of the Carnegie Museum. 



anticlinal zone of the ancient sedimentary rocks, flanked on each side 

 by gneiss or schist. 



Near Lavras there is a small serra, cut through by the Rio Salgado. 

 The rock exposed in the river gorge partakes both of the character of 

 gneiss and crystalline schist, carrying less muscovite than the quartzite 

 near Curema, but it contains garnets. It seems to be a small, isolated 

 mass of the quartzitic material of the Ceara Series. 



Between Lavras and Crato there are a few exposures of altered 

 shale, which, because of their nearly vertical dips, evidently do not 

 belong with nearby basal materials of the Cretaceous series. They 

 may be of the same horizon as shales found by Small farther south 

 along Riacho dos Porcos east of Jardim, which he classed with the 

 Ceara Series.^® 



About eight kilometers south of Saboeiro muscovite-quartzite is 

 prominently exposed in a small ridge where cut by the gorge of a 

 stream. The quartzite is flanked on each side by thinly laminated 

 schist, and half-way to Saboeiro a dark material, resembling an 

 altered shale, is exposed for a few meters along the road. Other small 

 exposures of this rock were seen in and near Saboeiro. About four- 

 teen kilometers northwest of this town a small patch of crystalline 

 limestone beside the road was noted by the writer's associate. Dr. 

 Manoel Arrojado Lisboa. 



Near Arneiroz the Rio Jaguaribe crosses a small serra, in which 

 there is a wide ledge of white quartzite, flanked by gneiss or schist. 

 At Pogo dos Paus, which is half-way between the quartzite ledges of 

 Arneiroz and Lavras, and east-northeast along the trend of the ledge 

 near Saboeiro, there are soft decomposed schists, with lenses or beds 

 of quartzite having a maximum thickness of about four meters,^^ 

 These may be of the Ceara Series, though there seemed to be only a 

 small area of such material. Northwest of Arneiroz, half-way to 

 Taua, altered shale was again seen for a few meters. Near Tau4 

 there is a prominent hill, which has as a core a vertical ledge of white 

 rock, which appears from a distance to be quartzite, though close 

 examination may show it to be a thick pegmatite dike. 



About eight kilometers southeast of Cratheus there is a small area 

 of crystalline limestone, locally burned for lime, and also small ledges 



3^ Publ. No. 25 of the Inspectoria, p. 40. 



'" Small presents a detailed geologic map of this locality in Publ. No. 25 of the 

 Inspectoria, PL V. 



