MAPS AND SECTIONS. 367 



Parts of Dumfriesshire and Kirkcudbrightshire, with the lower parts 

 of the basins of the Nith and the Ken. 



Comprises the following rock-formations : — Aqueous: L. Silurian 

 (Llandeilo and Caradoc), Calciferous Sandstone, Permian, Drift, Kaised 

 Beach, Peat, Alluvium. Igneous : Porphyrites in Permian beds, Granite, 

 Intrusive Felstones, Syenites, Diorites, and Basalt. The Silurian rocks 

 occupy throe fourths of the map. The Permian basins of Dumfries and 

 Thornhill, portions of which are here represented, lie in the valley of 

 the Nith. Small patches of the masses of Galloway Granite are also 

 shown, along with the associated metamorphic rocks. Glacial strife 

 abundant, " drums " of till well-marked. J. H. 



SheetSl. ByA.Geikie,E.Hiill, J. Geikie, B.N. Peach, and R. L.Jack. 

 L. Carboniferous bedded Porphyrites and tuffs of Carapsie Hills, with 

 some of the volcanic orifices filled up with Agglomerate ; Bedded basalts 

 and tufl^ of same age at Bathgate ; Carboniferous Limestone series, with 

 ironstones of Kilsyth ; Millstone Grit ; Coal Measures, with the valuable 

 coals and ironstones of Grangemouth, Palkirk, Airdrie, Wishaw, and 

 Glasgow ; unconformable Ked Sandstones overlying Coal Measures ; 

 Intrusive Basalts in sheets and dykes, the latter remarkably persistent ; 

 old stream-courses below Boulder Clay ; Eaised Beaches and Eroded 

 Terraces ; Peat and Alluvium ; many silted-up lakelets. E. L. J. 



Snake River. Map of the Sources of Snake River with its Tribu- 

 taries, together with Portions of the Headwaters of the Madison 

 and Yellowstone. U.S. Geological Survey of the Territories. 

 Scale 1 : 316,800, or 5 miles to an inch. The Geology by F. H. 

 Bradley. 

 The formations shown by colours are : — Archsean, Potsdam, Quebec, 

 Niagara, Carboniferous, Triassic, Jurassic, Tertiary, Volcanic Tertiary, 

 and Quaternary. There are profiles (outlines) of the mountain-ranges, 

 the chief being that of the Tetons. W. W. 



Stirlingshire. 10 Sheets of the Geological Survey Map. Scale 6 

 inches to a mile. 



Sheet 17. By B. N. Peach. (Stirling and Bannockburn.) L. Car- 

 boniferous or Calciferous Sandstone Series (Bed Sandstone and Cement 

 Stone Groups) ; Bedded Porphyrites (E. end of Cfimpsie Hills) ; Car- 

 boniferous Limestone Series, with outcrops of coals and limestones ; 

 Intrusive Basalt in sheets (Gillies Hill), whose position (above the 

 Harlet limestone) formerly gave rise to misconceptions regarding the 

 age of the traps of the Campsie Hills ; Boulder Clay, Kaimes, Sands, 

 Gravels, and clays of the 100 feet Raised Beach, Raised Beach of the 

 Stirling " carse." 



Sheet 18. By B. N. Peach. (S. Alloa, Dunmore, and Airth.) 

 Carboniferous Limestone Series, with outcrops of limestones, and coals, 

 Millstone Grit, Coal Measures, with outcroi) of coals at Dunmore ; 

 Boulder Clay, Kaimes, Clays, &c. of 100 feet Raised Beach ; Raised 

 Beach of " carse " of Stirling, and Recent Estuary Mud of the 

 Eorth. 



