334 



GEOLOGY OE THE DEXVEK BASIN. 



The general stratigraphy of the region about Golden is given in the 

 preceding chapters. The details of the coal measures are shown in figs. C 

 to F, inclusive, of PI. XVIII, and in the following section. 1 



Section, in part, of coal measures «t Golden. 



Nature of strata. 



Sandstone at top 



Coal 



Clay 



Coal 



Clay 



Sandstone 



Clay 



Black slate 



Clay 



Sandstone 



Clay 



Sandstone 



Coal 



Sandstone 



Clay 



Total to main coal bed 



Much variability is shown in these sections, not only by the measures 

 themselves but by the coal beds as well; it is therefore impossible to 

 identify the seams in the several mines without exploration of the entire 

 width of measures at each shaft. From the character and succession of 

 the exposed strata, however, it is probable that the coals are those between 

 sandstones B and ( '. 



The fossil flora of the Golden coal measures is abundant, though of 

 little variety. Oysters also were discovered l>\ Captain Berthoud, of 

 Golden, in the vicinity of the coal beds, though no note was taken of the 

 precise horizon. 



The oid white Ash mine. — This is in the south bluff of Clear Creek at the 

 upper edge of the town of Golden. It was among the rirst worked in 



1 From Annual Report of the 1 T . S. Geol. and (J< 

 VII, On the Geology of Colorado, 1873, p. 126. 



X. Surv. of the Territories. F. V. Ilayden. Vol. 



