ANNALS 



OF 



PHILOSOPHY. 



OCTOBER, 1821. 



Article I. 



On Floetz Formations* By Thomas Weaver, Esq. MRIA. 

 MRDS. MWS. MGS. 



The following remarks were called forth in part by a 

 perusal of M. D'Aubuisson's Traite de Geognosie,f in the au- 

 tumn of 1820. They were intended in part, also, as an appendix 

 to a paper written by me on some parts of Gloucestershire and 

 Somersetshire, and which was read some time since before the 

 Geological Society ; but observing that other geologists, both 

 foreign and British, are partly disposed to entertain the same 

 views as M. D'Aubuisson, I think it right not to delay in giving 

 them publicity.;}: 



In my memoir on the East of Ireland (Geol. Trans, vol. v.) I 

 have spoken of the old red sandstone, limestone, and coal form- 

 ation, of that country, as belonging to the Jirstjioetz series ; and 

 I have adverted to similar formations existing in England and 

 Wales. But M. D'Aubuisson remarks (vol. ii. p. 253, 254, and 

 313, 314), that the sandstone in question is, perhaps, a grey- 

 wacke, and the limestone, the transition limestone of Werner. 



* For the term floetz., some French, Italian, and English, writers substitute those of 

 secondary and tcrt'uiry ; but the only sense in which I use the word secondary is the 

 "Wemerian one ; comprehending both the transition and floetz formations, in contradis- 

 tinction to the primary. 



-\- Published in 1819, in two volumes, 8vo. 



£ I think it also right to state, that this article was digested before the appearance of 

 Prof. Buckland's Comparative View of the Formations in England and the Alps : a 

 view highly valuable and instructive, and affording ample evidence of the indefatigable 

 research and discriminating powers of the author. — (See Annul* "f P/tiki.mjihy for June, 

 1821.) 



New Series, vol. ii. r 



