U.S. NATIONAL MUSEUM 



S I LU RIAN 



COR 



GENERAL TIME SCALE 



Western New York 

 and Ontario 



Centra/ and Eastern 

 A/ew York 



APPALACHIAN VALLEY 



rlsnn.Md.and l/a. 



Becraft form. ^-ffl 



Tennessee 



DEVONIAN 



(HELDERBERGIAN] 



Becraft (N.Y) 



New Scotland (N.Y) 



Coeymans (N.Y) 



Keyser (W.Va.) 



New Scotland formation 



Coeymans Is. 



TrrfT 



TT>s. Keyser Is. - Decker Ferry Is.tM.J)^ 

 Manlius Is. . . T R^TTTrXTiuU 



z 

 < 



CD 

 D 



\ 



Manlius (N.Y.) 



Tonoloway (Md) 



Wills Creek (Md) 



Bloomsburg (Fa.) 



Akron dol. (Bullhead) 

 Bertie wl. 



Manlius Is. 

 ("fentaculite Is.) 

 Cobleskill Is. 



Trmrr 



Bossardville Is. 



Tonoloway Is. 



Sneedville Is. 



Wills Creek Is. 



Bloomsbur£ ss. 



SaJina - MSKenzie 

 (N.Y) (Md) 



Camillus sb. 

 Syracuse Sh. 

 Vernon &h. 

 Pittsford sh. 



(N.Y.) (N.J) 



High Falls sh.-Longwoodsh 



M-Kenzie form. 



z 



< 



< 







< 



Louisville (Ky) 



Guelph (Canada) 



Bob (Tenn) 



Beech River (Tenn) 



> 



Shelby dol: ' 



Racine 



(Wis) 



Waukesha (Wis.) 



Gasport Is. 



Waldron (Ind.) 



JP* 



Laurel 



(Ind) 



Decew Is . 



? Louisville coral zone 



Rochester (N.Y.) 



Rochester shale 



Irondequoit (N.Y) 



Williamson (N.Y) 



Wolcott (N.Y) 



Sodus 



(NY) 



Irondecjuoit Is. 



Williamson shale 



Typical 

 Clinton 

 formation 



Wolcott Is. 



Sodus shale 



Clinton group 

 (Keefer ss. near top) 



(Cacapon member 

 at base) 



:...., A'. ..'. ■,!.,. ...', 

 Thorold sandstone 



Grimsby ss L 

 Cabot Headship 

 Manitoulinbeds-3 



Whirlpool ss. J 



Thorold (Arthropliycus ss) 



Brassfield (Ky.) 



Noix 



(Mo) 



f-dgewood (Mo) 

 Wbiteoak (Tenn; 



Girardeau (Mo.) 



Medina 

 or 

 Tuscarora sandstone 



Brassfield Is, 



White Oak ss. 



Z 

 < 

 Z 



D 



LU 



2 



Elkhorn (Ind.) 



Whitewater (Ind) 



Macjuoketa (Iowa) 



Liberty (Ind.) 



Queenston 

 shale 



Waynesville (Ohio) 



Juniata sandstone 

 and shale 



Fernvale (W.Tenn 



Arnheim (Ohio) 



Dubuque (Iowa) 



Sequatchie 

 formation 



ORD0V1CIA' 



(CINCINNATIAN) 



Maysville 



Oswego sandstone 

 Pulaski formation 



Oswego sandstone 



Oswego sandstone 

 (Bald Eagle) 



Fairview 



