342 APPENDIX. 



by the porphyry slate, which (occurring only in 

 this formation) likewise contains this fossil. 



If the supposition which adopts at Oonalashka 

 members of the family of floetz trap, is correct, it 

 will be a confirmation of the near relation that has 

 been often noticed elsewhere between these form- 

 ations and volcanoes ; an affinity which must be 

 equally interesting to the Neptunists and to the 

 Vulcanists, though there is but little hope that 

 their contest will be decided on this remote field. 



From the shores of the harbour of St. Peter and 

 St. Paul, in Kamtschatka, green, yellow, and brown- 

 red jasper was brought, which is stated to lie there in 

 horizontal layers ; we also have from the peninsula, 

 without any knowledge of the place where it was 

 found, a beautiful calc-spar crystallization, (H.'s 

 equi-axe) on scales of chalcedony, and brown semi- 

 opal, the fragment of a kernel of the amygdaloid. 

 The southern Kamtschatka, therefore, probably 

 contains the same kind of rocks as Oonalashka j 

 and as, according to Mr. Langsdorfj; the Aleutian 

 islands, which lie between both, resemble Oona- 

 lashka in the exterior as in the volcanoes, it is to be 

 conjectured that the whole chain consists of floetz 

 rock. 



beering's strait. 

 Saline marble, resembling that which forms the 

 ruinetl rocks of St. Lawrence Bay, is regularly 

 found db strata in mica slate, and this probably is 



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