W. Cross — New Devonian Formation in Colorado. 247 



one) specifically apply to the exposures southwest of Devon 

 Point about one-half mile, where the sediments reappear beyond 

 the stream above mentioned, which has cut through them into 

 the granite. They apply as well, however, to the strata at 

 Devon Point. 



"Besting immediately upon this granite, which showed a 

 very marked stratification, conformable with that of the super- 

 incumbent sedimentary beds, a white to red and brown quartzite 

 was found. At some points the contact of the latter with the 

 granite was so intimate that specimens could be obtained, 

 showing both the granular quartzite and the coarse-grained 

 granite on the same piece. So definite relation of the colors 

 exhibited by the quartzite could be established, save the gen- 

 eral rule that the nearer it was to the underlying metamorphic 

 rock, the more intensely it was colored." * * "Above the 

 quartzite is a thin stratum of yellow siliceous shales, containing 

 narrow interstrata of softer shales. In these the well-known 

 aud characteristic pseudomorphs after salt were found. During 

 the formation of the Devonian beach that now remains quartzite 

 aud quartzitic shales, portions of the water, that even at so 

 early a geological period contained sodium chloride, were sepa- 

 rated from the main body. Upon evaporation the mineral 

 constituents of the water crystallized. Subsequent inunclatioDs 

 of the places that had scarcely been laid dry, brought with 

 them sand and silt, covering the newly formed crystals. By 

 the gradual percolation of water through the cover the salt was 

 dissolved, and a quantity of the material composing the cover 

 found its way into the cavities thus produced. It will be 

 noticed, therefore, that whenever these pseudomorphs of sand 

 after salt are found in positu, the crystals will be observed on 

 the loicer side of the stratum containing them. Occurrences 

 of this kind are not infrequent in younger formations both of 

 this country and Europe. Besides these pseudomorphs, scales 

 and fragments of bones are found, belonging to some fish of 

 considerable size. Too little material could be collected to 

 admit of any identification, even only generically. Small 

 scutellae also occur, probably belonging to the same animal. 

 This stratum, as well as the quartzite underlying it, can be 

 traced on the southern side of the granite strip." * 



In the summer of 1901 the southern portion of the Needle 



* Endlich conceived the granite of this region to be an extreme product of 

 the inetaniorphism of early Paleozoic sediments, and this view seems to have 

 influenced his statement that at Devon Point the granite (i showed a very- 

 marked stratification, conformable with that of the superincumbent sedi- 

 mentary beds." In fact, the granite is unusually coarse-grained, massive, 

 and homogeneous in composition, exhibiting nothing to warrant the repeated 

 references to its origin from sediments. 



