386 Professor Sedgwick and Mr. Murchison on the 



region, and a new interest to its mineralogical details. These phenomena 

 are the more important, from their obvious connexion with the old volcanic 

 operations which are known to have modified the features of a large portion 

 of Hungary. 



This introductory sketch will serve, we hope, to explain our views of the 

 structure of Lower Styria ; and we now proceed to illustrate and confirm 

 them by two detailed sections — one drawn nearly from west to east, com- 

 mencing with the hills above Eibeswald, and extending to Radkersberg on 

 Mur, close to the Hungarian border — the other nearly from north to south, 

 commencing at Riegisburg, passing through the volcanic region above 

 mentioned, and ending at Radkersberg, where it crosses the other line of 

 section*. 



1 . Detailed Section of the Tertiary Formations between Eibeswald and 



Radkersberg. 



The accompanying section (fig. 16.) begins at the ridge of the Radlberg, 

 elevated about 2000 feet above the level of the Mur, and passing through 

 the inclined system of secondary green sand (beneath which the primary 

 schists are in several places laid bare), descends to the tertiary groups, which 

 we now proceed to describe, as they appear in the section, in the ascending 

 order. 



1. Shale and sandstone with coal. * 



There are probably several seams of coal among the oldest beds of shale 

 and sandstone : one of the lowest is worked at a place call Pampana, very 

 near Eibeswald, and is about four feet and a half thick. It rests immediately 

 upon the grits and conglomerates of the Radlberg. From this point, a tor- 

 tuous line drawn along the flank of the Schwanberg Alp intersects several 

 seams of lignite, as at Steierich, St. Tuluri, Sheineck, &c. Of these coal 

 beds, that at Scheineck is the most interesting, on account of its organic 

 remains. Beds of sandy, micaceous marl there occupy the right bank of a 

 little stream called the Weisse-Sulm ; and the coal is extracted from the 

 base of an escarpment by horizontal galleries which follow the line of 

 deposit. The coal itself is about three feet in its greatest thickness, but it 

 thins off to a few inches, in the face of the cliff from whence the drift 

 proceeds. It is imbedded in calcareous shale, which contains many large 

 stems of arundinaceous plants, and a considerable number of Gyrogonites, 



* Plate XXXVI. Fig. 15 & 16, 



