Mr. Horner on the Geology of the Environs of Bonn. 



471 



Grauwacke. 



Feet. 



Greatest height to which it rises on south 



slope of Mendenberg 908 



Ditto between the Hummerich and Mit- 



telberg 841 



Ditto on west slope of Petersberg .... 658 



Trachyte. 



Drenkelberg 1188 



Briingelsberg 1131 



Lohrberg 1 125 



Scheerkopf 1073 



Bruderkunzberg 1022 



Hummerich 996 



Gross Mittelberg 936 



Buckeroth 927 



Wasserfall 919 



Perlen Hardt 917 



Gross Rosenau 883 



Gross Geisberg 871 



Jungfer Hardt 865 



Wolkenburg 865 



Gross Breiberg 846 



Schallenberg 818 



Klein Mittelberg 799 



Drachenfels 780 



Stenzelberg 760 



Hirschberg 579 



Trachyte Tuff. 



Rises to height of: 



On west slope of Oehlberg 



At Margaretha Kreuz 



On south-east slope of Geisberg 



On north slope of Nonnen Stromberg. 



933 



834 

 776 

 638 



Basalt Dikes. 



Keilsbrunnen, through trachyte 



Lowenburg Tranke, through trachyte 



785 

 949 



Feet 

 Between Drachenfels and Hirschberg, 



through trachyte 443 



Steinsbusch, through grauwacke 216 



Siegburg, through trap tuff 211 



Wolsberg, through trap tuff 230 



Grimprich, through trap tuff 189 



Konigsvvinter Holle, through trachyte 



tuff 184 



Basalt. 



Diisberg, near Linz 1325 



Gross Oehlberg 1289 



Lowenburg 1272 



Mendenberg 1198 



Klein Oehlberg 974 



Leyberg 974 



Petersberg 904 



Nonnen Stromberg 818 



Ober Dollendorf Hardt 619 



Limberg 598 



Gross Wirlberg 597 



Steinringsberg 565 



Hartenberg 550 



Gross Scharfenberg 560 



Thomasberg 541 



Falkenberg 538 



Rabenlei 420 



Hinzberg 429 



Finkenberg 210 



Brown- Coal Formation. 



Stoschen, at foot of Mendenberg 913 



At village of Vinxel 400 



At Orsberg, near Erpel 372 



Between Drachenfels and Wolkenburg. 445 

 Auf dem Stein, near Ober Cassel, where 



a bed of silicified wood was found . . 402 



At Rott, where fish are found 298 



At Tanzchen, sandstone beds 226 



