364 On Metallic Minerals. 



distinct terraces rising one above the other. The lower- 

 most is nearly on a level with the water — the next, on 

 which the principal buildings are constructed, is from 

 fifteen to twenty feet higher, and the third may be about 

 fifty feet above the river ; on the opposite side of the river 

 the limestone forms a cliff nearly perpendicular, and of 

 about the same height. An anonymous writer in No. 2, of 

 the Canadian Revieiv, states the whole body of limestone 

 here to be two hundred feet high, this I think greatly 

 overrated, one hundred is certainly the outside. He also 

 says that an argillaceous sandstone of a red, grey, and green 

 colour is found at the lower terrace, forming alternating 

 layers ; this is a mistake, these stratified masses are lime- 

 stones, as their free effervescence in acid declares them to 

 be — neither are they seen resting on sienite, although they 

 may be fairly presumed to do so, as that rock crops out near 

 at hand. The cascade is caused by its appearance, and it 

 is seen in many places above on the left bank of the river, 

 but the limestone conceals it on the right bank. Its consti- 

 tuents appear to be red felspar and light green epidote. — 

 I did not perceive, as in the neighbourhood of Kingston, 

 the actual contact of the sienite and transition limestone, 

 although they were separated by a very few feet of soil and 

 verdure, which of course concealed it, if it takes place ; 

 neither did I perceive fhat conglomeration in the limestone 

 near the sienite, which is so remarkable near Kingston, 

 where masses of the sienite both round and angular are 

 found imbedded in the lowermost strata of limestone or at 

 the junction of the two rocks, (seethe 18th vol.of Silliman's 

 Journal.) Near this junction and forming a bed in the 

 sienite is observed a white crystalline marble of a finer 

 grain than any other I have yet observed iu this country. — 



