588 



GEOLOGY OF CENTRAL WISCONSIN. 



and 18, T. 10, R. 8 E. The area over which the sandstone is present is not more, prob- 

 ably, than 40 rods in diameter, but the top of the bluff reaches an elevation of about 

 630 feet above Lake Michigan, or upwards of 450 feet above the adjacent river, so that 

 it constitutes one of the most striking points in the scenery of this part of the valley of 

 the Wisconsin, rising far above all of the immediately surrounding country. Section I, 



FIG. 41. 



4- 



: ^^^-- * 



SBCTION ACROSS THE VALLIJY OF THE WISCONSIN IN WEST POINT AND MBRKIMAC. 



j^ g Line of profile. Horizontal scale 9-lOths inch equals 1 mile. Vertical scale, 400 feet equals 



1 inch. 



of Plate XXIII, and the north and south section attached to the Atlas Map of Area E, 

 show its relation to the neighboring elevations. Fig. 42 is a rough diagrammatic sketch 

 meant to give some idea of the character of the western face of this remarkable bluff, 

 whose structure is further indicated by the section of Fig. 43, which is drawn to a nat- 

 ural scale. 



FIQ. 42. 



SKETCH OF THE WESTERN FACE OF GIBRAJ.TER BLUFF. 

 Natural scale, 1 : 3660. 



