GEOLOGICAL OBSERVA'nO^'S IN FRANCE. 301 



Without c<sr. 

 for temperature. 



Summit of Mont d'Or* • 958-500 Table of 



Circus at the footT3f Mont d'Or, before the June- SevcUflh? 



tion of the waters of the d'Or and the Dogne • • GiroOO sea. 



Summit of Mount Cupuein f 709*500 



La-Tour-d'Auvergne+ • • 472-833 



Murat-le-Qnayre, at the chateau 539*000 



Rocks on the Dordogne, about half a mile lower § 417-6G6 



St. Laurent-des-Mures • 117*000 



Bourgoin 173*200 



La-Tour-du-Pin 158*200 



Pont-de-Beauvoisin 1 18*000 



The lake of Epin or Aiguibellette • 193*334 



Mount de I'Epin 463 666 



Sect. III. 



Brief description of several mount ains in the department o/" Mountains 

 ^t T > 1 near the lake 



the Leman lake. ' of Geneva. 



Mount Salhe, four miles east of Geneva, is narrow, but Sal^ve. 

 of considerable length froiii N. N. E. to S. S. W. On the 

 W. N. W. it exhibits naked and steep rocks, in nearly hori- 



circus, truly alpine, terminated on one hand by the sides of the valley of 

 la Cour, and on the other by the rock of the Cousins. These answer to 

 each other, and formerly closed the circus on the side of the valley of 

 Bains. But the whole of this vast circus cannot be a crater. I conceive, 

 continues Mr. von Buch, that there are two, the valley of la Cour, and Formerly two* 

 the funnelshaped hollow between Cacadogiie and the rock of the Cou- 

 sins; the remamder of the cavity was formed by the falling in of the 

 parts between these two craters, as is shown by the bare and salient an- 

 gles below the summit of Mont d'Or, and the valley of Enfer. 



* According to Cassini the height of this mountain above the sea is 

 Y048 toises : and he afterward calculated by the barometer its height ^ 



'above the village of les Bains to be 512 toises, while according to our 

 observations it is only 435. 



' \ Cassini makes this 224 toises higher than les Bains, and 760 above 

 'the level of the sea. 

 ., X ^ causeway of basaltes in prisms of six feet diameter, with deci- Basaltes evi- 



sive appearances of having been oritjinally a stream of lava, is seen here. "^, v "om a 

 ■ \. J^ , ^ J i volcano. 



Von Buck. 



§ In this place is a grand colonnade of basaltes resembling the pipes Colonnade of 



of an organ. it. ^ 



zontal 



