414 Mr. Weaver on Floetz Formations. [Dec. 



also, white sand is found in this formation. Cylindrical petrifac- 

 tions, resembling those of the southern tract, are met with, 

 beside pectinites. But both the northern and southern quader- 

 sandstone tracts require to be strictly examined with respect to 

 organic remains. 



In extending his views of this formation to other tracts, M. 

 von Raumer notices the observations of M. Flurl on the Alps of 

 Upper Bavaria, in which sandstone and marl, coloured green by 

 chlorite, are found containing nummulites in great quantity. 

 And as nummulites are found also in the green sandstone of 

 England and France, the identity of those formations is thence 

 inferred. M. Ebel likewise states, that the beds of green sand- 

 stone in the most northern chain of the calcareous Alps, contain 

 nummulites very frequently, beside other organic remains, e. g. 

 in the Aubriggs, Zindeln, Flasch, Sec* 



Of the extent and character of the ferruginous and green 

 sandstone and limestone formation in England, including the 

 beds of clay, marl, and wood coal, associated in that series, a 

 general idea may be obtained from Mr. Greenough's Geological 

 Map, comprising the groups No. 8 up to No. 6 inclusive ; and 

 various facts in elucidation of the formation may be gathered 

 from the observations of Mr. Webster in the Geological Trans- 

 actions, and in Sir H. Englefield's work on the Isle of Wight; 

 from Mr. W. Phillips's Geology of England and Wales ; and 

 from Mr. Sowerby's Mineral Oonchology. But a still more 

 ample view of the relations of that series may probably be soon 

 expected from the work of Mr. Mantell on the Geology and 

 Fossils of Sussex, of which the prospectus has recently ap- 

 peared, f 



3. Chalk.— (Kreicle.) 



Upon this formation I do not think it necessary to offer any 

 remarks. Its principal relations in England have been developed 

 by Mr. Webster ; and additional light will doubtless be thrown 

 on the subject by the extended researches of Mr. Mantell. A 



feneral list of organic remains found in chalk has been given by 

 'rofessor Jameson in his instructive notes on Cuvier's Theory of 

 the Earth. 



Floetz. — Series IV. 



Nor is it my intention at present to enter upon the considera- 

 tion of the fourth floetz series, which would require a more 



" Alpenbau, vol. i. p. 372. 



•J- According to that prospectus, the work will embrace the ferruginous sand; weald 

 clay, with subordinate beds of sandstone and limestone ; green, grey, and white sand ; 

 blue clay or gait; chalk marl, lower chalk, and upper chalk; plastic clay formation; 

 and alluvium. Some very valuable preliminary notices of the organic remain* contained 

 in those formations, were published bj that author in the Sussex FrorincM Magazine 

 fcrth* year 1819. 



