18 EXISTENCE OF MECHANICAL DEPOSITS. 



Of vegetables. VEGETABLE REMAINS. 



1 . Werner obferved great trees, with branches, leaves, and 

 fruit, in the wacken, at Joacbimfthal. 



2. Friefleben defcribes the impreflion of a plant in the 

 Kawfower Berg, near to Podfedlitz. 



3. In the iflands of Banna and Skye I obferved pieces of 

 wood in Trapp Breccia, and Mineralogy of the Scottifh ifles, 

 vol. ii. p. 58 — 75. 



Organic remains Organic remains found in flaty clay, limeftone, and fand- 

 iimeftJnc^and ft° ne > which belongs to the Flotz Trapp formation. 



fandftone,of this 



formation. SHELLS. 



Shells. i. Abbe* Fortis, in his account of the valley of Ronca, in- 



forms us, that limeftone and flaty clay often alternate with 

 bafalt, wacken, and trapp breccia. The limeftone and flaty 

 clay contains numerous petrefactions of fhells, which are of the 

 fame kinds with thofe found in the bafalt, wacken, and trapp 

 breccia. 



2. In the ifland of Eigg, where there appears to be a fimi- 

 lar formation with that of Ronca, I obferved that the lime- 

 ftone, flaty clay, and fanditone, contained numerous petre- 

 factions of fhells. Mineralogy of the Scottifh ifles, vol. ii. 

 p. 



Of vegetables. VEGETABLE REMAINS. 



1. At the northern extremity of the ifland of Skye, where 

 bafalt alternates with limeftone and flaty clay, I obferved 

 pieces of carbonated wood in the limeftone. Mineralogy of 

 the Scottifh ifles, vol. ii. p. 80 *. 



2. In the flinty fandftone, which ufually accompanies this 

 formation, I have obferved branches of fhrubs; vegetable 

 matters that occur inveloped in rocks are generally, either 

 carbonated or bituminated, here however they are not altered. 



R. JAMESON, 

 Sheriff" Bra:, Leith. 



* Mr. Kirwan, in the firft volume of his Syftem of Mineralogy, 

 has given us an excellent account of the different opinions refpecling 

 the formation of bafalt j and has adduced many arguments that 

 (hew the fallacy of the Volcanic and Plutonic hypothefis. 



POSTSCRIPT. 



