ABSTRACTS 4^7 



nar section. The different manners in which the formations deca}' is 

 discussed, and the dependence of the residual soils and surface 

 forms on the nature of the underlying rock is brought out. Great 

 lithologic changes occur in the formations of this region, and the 

 Knox dolomite is the only one which is uniform throughout. The 

 direction of change was exactly reversed between Cambrian and Silur- 

 ian times. 



In the discussion of "Structure," after a general statement of the 

 broader features of the province, two processes by which the strata of 

 this quadrangle were deformed are noted. Of these the extreme 

 Appalachian folding accompanied by faulting and metamorphism is by 

 far the more prominent and is about equally developed throughout 

 the quadrangle. Faults, especially, are most strikingly exhibited here. 

 Deformation by vertical uplift is also exhibited, but it is only noticeable 

 in comparison with broad surrounding areas. In this quadrangle the 

 great valley is at its narrowest, on account of the extreme shortening 

 in deformation. The structure sections illustrate the sharp folds and 

 ireqilent faults into which the strata were forced. Economic products 

 otthis region are coal, variegated marble, red hematite, building stone, 

 lime, clays, slate and timber. The outcrops of the formations containing 

 these are indicated on the economic sheet, together with the locations 

 of the mines and quarries. The iron ore and slate are at present of 

 minor importance. The coal district is a part of the great coal basin of 

 Tennessee, and the marble belts are a part of the principal productive 

 region for that stone. Various conditions affecting the value of these 

 deposits are pointed out, and the associations and availability of the 

 buildina: materials and timbers are discussed. 



Geologic Atlas of the United States. Folio 27, Morristow)i, Tennessee, 

 1896. 

 The Morristown folio by Arthur Keith, deals with that portion of 

 the Appalachian province which is situated between the parallels 36° 

 and 36° 30' and the meridians 83° and 83° 30'. This area contains 963 

 square miles, divided among the counties of Green, Cocke, Jefferson, 

 Hamblen, Grainger, Claiborne, Hancock, and Hawkins, all in Tennes- 

 see. Included in the folio are topographic, economic, and geologic 

 maps, structure and stratigraphic sections, and five pages of descriptive 

 text. 



