242 



OUTLIERS OF LUDLOW ROCKS. 



The appearance of these outliers of Ludlow rock near Broseley are of theoretical in- 

 terest, as showing that the formation has extended under the coal-field ; whilst there is 

 great reason to think that the Old Red Sandstone thinned out towards the north, and 

 that the carboniferous deposits near the Iron Bridge, may have been originally deposited 

 upon Upper Silurian Rocks. 



/ 



