M. Keilhau's Theory of Granite and other Rocks. 401 



vations, we brought them together for comparison. The results 

 were truly surprising, and were, I think, of the highest import- 

 ance, theoretically considered. The following is what possesses 

 most interest for us at present : — In somewhat more than the 

 whole northern half of the Christiania territory, there prevails 

 in the stratified districts, disregarding a number of local irre- 

 gularities, a law with regard to the position of the strata that 

 cannot be mistaken, according to which, the dip is commonly 

 above 45° nearly N. NW., a result which also agrees with 

 that obtained in the Upland transition territory lying imme- 

 diately to the north. Deviations from this law are found with 

 equal frequency at points most remote from the boundaries 

 of the massive rocks, as in their immediate neighbourhood, 

 and our observation proves, in a manner which cannot be 

 controverted, that these rocks could not have had any influence 

 on the position of the strata, but that, on the contrary, this po- 

 sition, with aU its irregularities, as well as its regularity, in 

 short, in every respect as it now exists, xoas produced before the 

 formations spoken of were present in the territory. This is now 

 to be a little more exactly explained. The map shews that the 

 stratified districts for the most part only occur as very narrow 

 stripes around the massive districts, and are partly separated 

 from one another. It must have been a very remarkable acci 

 dent, and one which was not to be looked for, that these now 

 separate portions of what must undoubtedly at one time have 

 been a continuous whole — with regard to the earlier connection 

 of which we are at one with the eruptionists — should in this 

 inanner have a conformable position of strata, if that had not 

 existed before the separation. Let us particularly attend to the 

 stripes running north and south ; here the strata are transverse, 

 and therefore quite short ; they are thrust against the massive 

 granite, are cut off by it, and still preserve their usual dip and 

 direction. When we remember the parallelism already men- 

 tioned with the strata in the other territory, which has certainly 

 been separated from the Christiania territory only by denuda- 

 tions of their common basis; upon which these massive moun- 

 tain rocks could not act ; and which, indeed, contains almost 

 none of such masses, it seems evident enough that the arrange- 

 ment of the strata here is a phenomenon which in its cause is 



