6B4 PROCEEDINGS OF THE NATIONAL MUSEUM. 



GEOLOGICAL POSITION OF THE PRINCIPAL INSECT-BEARING 

 LOCALITIES OF THE AMERICAN PALEOZOIC. 



The American spei-iiuens of Paleozoic insect.s have been generally 

 hroiig-ht to lio-ht in tiie search for fossil plants, and accordinoly they 

 are o-eolog'ically referred to more or less well-known plant beds. 

 Exceptions are those from the shales above the Ames (Crinoidal) lime- 

 stone at Richmond and Steubenville, Ohio. It must be remembered 

 that for stratigraphical or areal purposes various formations have 

 been recognized in more or less distant areas of the American coal 

 fields, and the exact interequivalence of these has in many cases not 

 yet been ascertained. The anthracite coal fields also have a strati^ 

 graphical nomenclature for the most part different from that in use 

 in the bituminous regions, the subdivisions being largely according 

 to the grouping of the coal beds or "veins."" which in the Northern 

 Anthracite field (Pennsylvania) are lettered from the base upward. 



In the following list the geological foriuation and horizon or stage, 

 so far as the latter has been determined by paleobotanical or strati- 

 graphical correlations, will be given in connection with the designa- 

 tion of each locality. In a number of instances a locality has been 

 cited in various papers in different terms, which have sometimes been 

 erroneously interpreted to mean distinct places. Such cases wi^l be 

 pointed out below: 



1. Near Altamont No. 1 Colliery, anthracite region, Pennsylvania. Lower Potts- 



ville; Lower Lykens group. Waidenburg-Ostrauer. ( = "Lower Lykens of 

 Pottsville, Altamont Colliery, Pennsylvania.") 



2. Boston mine, near Pittston, Pennsylvania. Near top of Pottsville series; L^pper 



Transition group. Lower Westj^ihaiian. ( = " Lowest productive c. m., 

 Boston mine near Pittston, Pennsylvania.") ( = "Roof shales of coal C, 

 Boston mine.") ( = "Upper Coal Measures (coal C) Boston mine.") 



3. Butler mine, near Pittston, Pennsylvania. Anthracite series; Pittston or E coal. 



Lower Stephanian. This coal lies paleobotanicalh^ in or hear the Freeport 

 stage of the Allegheny formation of the bituminous coal fields oi Pennsylvania. 

 ( = " Pittston coal in the Butler mine at Pittston, Pennsylvania.") 



4. Campbell's Ledge, near Pittston, Pennsylvania. Near top of Pottsville; Upper 



Transition group. Lowest Westphalian. ( = " Interconglomerate of Mill- 

 stone Grit of Campbell's Ledge, Pittston, Pennsylvania.") ( = " Intercon- 

 glomerate Upper Coal Measures, Campbell's Ledge, Pittston, Pennsj'l- 

 vania.") ( = " Upper Coal Measures, Upper Campbell's Ledge, Pittston, 

 Pennsylvania.") 



5. Cannelton, Pennsylvania. Allegheny formation; Kittanning group; roof of the 



Middle Kittanning coal. Westphalian. ( = " Bituminous coal shale of the 

 Lowest Productive Coal Measures, Cannelton, Pennsylvania.") 



6. Cassville, West Virginia. Dunkard formation; parting in the Waynesburg coal. 



Probably Autunian. 



Note. — The main body of the Waynesburg coal bed forms the topmost 

 stratum of the Monongahela formation. But, for convenience in 

 grouiiing, the richly phmt-bearing shale parting in the upper part of 

 the coal was placeil, with the toj) shale and sandstone, in the base of 



