156 



AN AMERICAN GEOLOGICAL RAILWAY GUIDE. (MO.) 



5. Archimedes in limestone. 



6. On St. Louis & San Francisco R. R., going southwest, after leaving Pacific (or Franklin) the 

 2d Magnesian limestone gradually rises, showing some 2d sandstone, and through Crawford, 

 Phelps and Pulaski counties the latter is the highest rock, resting ou 3d magnesian limestone, the 

 latter well exposed along the Gasconade River. Crossing it, we are upon the highest lands in 

 Missouri. Descending towards Springfield, we find the Lower members of the Sub-Carboniferous 

 limestone resting on the 2d Magnesian limestone or Calciferous. In southern parts of Lawrence 

 county we find a coarse ferruginous sandstone, probably equivalent to Millstone Grit, but more 

 probably a member of the Chester group, resting on Lower Carboniferous limestone. Throughout 

 Newton and Jasper, the Sub-Carboniferous limestone, with much chert is of great development, 

 and is galeniferous. The celebrated lead mines of Joplin and Granby occur in this. 



