840 SEC. 16. GEOLOGY AND MINING. 



Constructed from the maps of the former electorate of Hesse, the level lines 

 in which were taken at a distance of 60 Prussian feet apart, so that the surface 

 of the North Sea is represented by 0. 



The distribution of the rocks is shown in colours according to the observa- 

 tions of Dr. Mohl and the exhibitor, as follows : 



Carmine - - , the lower group of the " Bunter " sand- 



stone, or New Red Sandstone. 



Reddish yellow - - the upper group of the same. 



Blue - " Muschelkalk." 



Light-greenish grey - clay and sand with lignite. 



Dark -greenish grey - marine sand rich in fossils, and septarium 



clay (Upper Oligocene). 



White - alluvium. 



Black "<?M; - basalt. 



Brown - v\V^ " basalt conglomerate. 



Villages are shown in vermilion, railways and high roads in black, standing 

 and running waters iu blue, with corresponding figures referring to index, 

 which is attached to the relief. 



- '& - 



3285. Geological Sections. University Museum, Oxford. 



Coast of Dorset, from Lyme Regis to Isle of Portland. 



Slapton Sands, between Dartmouth and Plymouth. 



Dunolly Castle, near Oban. 



Brent Tor, near Tavistock. 



View from Exmouth. 



Parallel Roads of Glen Roy. 



Section from Beerhead to Axmouth. 



Country between Malverns and Cotswolds. 



Coast of Dorset between Charmouth and Abbotsbury. 



Submarine Forest of Stolford. 



Views of the Coast of Devon E. and W. of Sidmouth (2). 



Sections of Landslip. 



Bird's Eye View of part of Devonshire. 



View of Cliffs, Lyme Regis. 



3287a. Microscopical Preparations of Spanish Rocks. 



Francisco Quiroga, Madrid. 



1. Spanish silicious diatoms. 



2. Rutile from Horcaguelo (Madrid). 



3. Molibdate of lead from Quentar (Granada). 



4. Tourmaline from Buitrago (Madrid). 



5. Tremolite from the province of Guadalayera, composed oftremolite and 



glass. 



6. Meteorolite from Molina (Murcia), 24th December 1858 ; composed of 



pyroxene, peridot, and other metallic substances. 



7. Meteorolite from Molina (Murcia), 24th December 1858; insoluble 



silicate produced by the action of acids ; formed of pyroxene. 



8. Meteorolite from Cangas de Onis (Asturias), 6th December 1866 ; it 



is formed of pyroxene, peridot, and metallic substances. 



