Geological Societi/. 1 39 



Stratified Analluvion. 

 Post Diluvion. 



Ante Diluvion Diluvium ? ? 



Basalt Basalt. 



3rd Grau- f Pvritiferous Grit 1 /-, , £■ i-, , , 



vvacke. { Pyritiferous Slate/ " ' ^'^^' measures of England. 

 Cornitiferous Lime Rock^j 



Geodiferous Lime (lock > Carboniferous Limestone. 



T • f Calcareous Grit J 



1 Calcareous Slate l , .. „, , 



Ferriferous Rock / L'^^^^' Limestone Shale. 



Saliferous Rock 1 t Old red-stone, similar to that of 



Millstone Grit J ' ' 1 Monmouth. 



2nd Grauvvacke Grauwacke Slate. 



Metalliferous Lime Rock. . -» rTransition Limestone ; with En- 



Calciferous Sand Rock . . \....< ^''"1^' Mf^^'-^o'-e^^ Corals, 



Sparry Lime Rock J ( ^'-'lob.tes, Productse, Spuufe- 



^ ^ V ra, &c. 



1st Grauvvacke Whetstone-Slate, and Alum-Slate. 



Argillite Clay-Slate, and Flinty Slate. 



Granular Lime Rock Primitive Limestone. 



Granular Quartz. 



Talcose Slate Talcose Slate. 



Hornblende Rock. 



Mica Slate Mica Slate. 



Granite Granite. 



It is stated, moreover, to be the opinion of Mr. Eaton, that the 

 coal measures of North America are analogous to those found at 

 Cioughton on the Coast of Yorkshire ; and consequently that the 

 English oolite in which that coal is included, is represented by what 

 he calls the 3rd Grauvvacke. The author dissents altogether from 

 this doctrine. His opinion is, that neither the oolite, nor indeed any 

 of the beds which are in England higher in the series than the coal 

 measures, are to be found in North America, at least, north of the 

 40° north latitude j unless, perhaps, a very thick and extensive bed 

 of marl, destitute of fossils, but containing Septaria, and not unfre- 

 quently pebbles, (designated by Mr. Eaton by the term antediluvion), 

 — which, though the author has not been able as yet to refer them to 

 any of the regular formations, may hereafter be found to belong to 

 some stratum in the English Series! 



In confirmation of the opinions liere advanced, the author gives 

 a detailed account of observations made by himseif in the course 

 of an excursion from the City of Albany to the Hilderberg moun- 

 tains, over a plain which extends about 30 miles from north to south, 

 and IG miles from east to west. The surface of this plain, which is 

 324 feet above the level of the Hudson River, consists of sand incum- 

 bent u|)on u very thick deposit of the marl above noticed, which is 

 found also in various parts of the United States as far south as 

 Louii-iuna. Near the Hudson River this marl is incumbent upon 

 transition rocks, but at the Hilderberg mountains, on carboniferous 

 iimeslone, containing the fossils usually found in that formation, and 



T '1 imperfect 



