340 APPENDIX. 



change into cacli otlier. Tlie amygdaloid con- 

 tains calcspar, much green earth, stilbite, glassy 

 felspar, also small nests of red iron-stone; the 

 porphyry, properly only a condensed amygda- 

 loid paste, sometimes becomes jasper, and has, 

 besides the minerals already mentioned, also small 

 crystals of common felspar. Where green earth 

 was accumulated, the colour of the stone changed 

 into grey green ; where flinty earth and iron pre- 

 vails, it increases in hardness, where they are 

 wanting it becomes clay, and changes into sand- 

 stone, resembling that of coal. 



These kinds of rock (most of which have a 

 striking similarity with those which are met with 

 in the interior of the same formation, upon the 

 Nahe, on the left bank of the Rhine, and in the 

 north of Germany) were found partly on the east, 

 partly on the west side of Captain's Harbour, (a 

 bay of the north coast,) in steep pointed rocks, 

 which are subject to continual changes. Where 

 travellers formerly saw and sketched conical sum- 

 mits, (as SaritschefF did,) there were now saddle- 

 shaped hollows ; the fragments of the former sum- 

 rait covered the sides j where Dr. Eschscholtz, 

 during his first stay at Oonalashka, in the year 

 1816, had seen these hollows flat, he found them 

 farther hollowed out on his second visit to Oona- 

 lashka, in 181 7j 'i»d the formerly low round tops 

 of the lateral boundary changed into small peaks. 

 Earthquakes had not now been the cause of those 



