30 TIIE DEVONIAN AND CARBONIFEROUS. [bull. 80. 



In the American Journal article, four pages, entitled " Geological No- 

 menclature Exhibited in a Synopsis of North American Rocks and De- 

 tritus," are inserted between the regular pp. 144 and 145, which appear 

 to be a reprint of pages of the work as printed in Albany. This " No- 

 menclature" gives the following list of the classes of rocks : 



Class 1. Primitive rocks ; being those which contain no organic relics nor coal (in- 

 cluding Granite, Mica slate, Hornblende rock, Talcose slate, Granular Quartz, Gran- 

 ular limerock). 



Class 2. Transition rocks ; being those which contain marine organic relics only, 

 and in some localities Anthracite coal (including Argillite, First Graywacke, Sparry 

 limerock, Calciferons sandrock, Metalliferous limerock, Second Graywacke). 



Class 3. Secondary rocks ; being those which contain, in some localities, dry-land 

 or fresh-water organic relics, as well as marine, or bituminous coal (including Mill- 

 stone grit, Saliferous rock, Ferriferous rock, Lias, Geodiferous limerock, Cornetifer- 

 ous limerock, Third Graywacke). 



Class 4. Superincumbent rooks ; being those Hornblende rocks which overlay others 

 without any regular order of superposition, and supposed to be of volcanic origin 

 (including Basalt). 



classes of detritus. 



Class 5. Alluvial detritus ; being those masses of detritus which have been washed 

 into their present situation (including Auti-Diluvion, Diluvion, Ultimate Diluvion, 

 Post-Diluvion). 



Class 6. Analluvial detritus ; being those masses of detritus which have not been 

 washed from places, showing they were first formed by the disintegration of rocks 

 (including Stratified Aualluviou and superficial analluvion). 



The localities are given for each of the above mentioned kinds of 

 rocks, and we find them in Massachusetts, Connecticut, and New York, 

 in the latter State mainly along the line of the Erie Canal. 



A few of the names used in this " Nomenclature" are still retained, 

 with no, or but slight, modification. " Calciferous sandrock," and 

 under "Metalliferous limerock," " Birdseye marble" is mentioned as 

 a variety of it j under the term u Third Graywacke," with the subdi- 

 vision " Pyritiferous rock," is described what we now know as the De- 

 vonian rocks of the State of New York, including the Catskill, or what 

 were known as the Old Red sandstone of Werner, but not including 

 the Lower limestones. Eaton's '* Cornetiferous limerock " appears to 

 be a name covering both Lower Helderberg and Upper Helderberg 

 rocks of our present classification, and his " Third Graywacke " rested 

 upon the "Cornetiferous limerock." In this paper Eaton pointed out 

 the distinction between " general strata," which he finds in America 

 " can be traced for an extent of 100 or 300 miles," and " beds or vari- 

 eties " of the former. 1 



According to this proposed nomenclature, " the Lias, Geodiferous 

 limerock, Cornetiferous limerock, and the Third Gray wacke occupied 

 as uppermost rocks more than half of the great States of New York, 

 Pennsylvania, Virginia, and nearly all the States of Ohio, Indiana, 

 Illinois, Kentucky, Tennessee, and Michigan Territory," and he says 



•Am. Jour. Sci., vol. 13, p. 361. 



