1520 BULLETIN f>2, UNITED STATES NATIONAL MUSEUM. 



St. Thomas sandstone, Cambro-Ordovi- 

 cian, Missouri. 



Salina group = Lower Cayugan. 



Salmon River sandstone (=Oswego), 

 Cincinnatian, New York. 



Saltillo limestone (= Hermit age) Trenton, 

 Tennessee. 



Saluda bed (= Whitewater) Richmond, 

 Ohio Valley. 



Sal visa division of Perry ville, Trenton, 

 Kentucky. 



San Saba series, Silurian (?), Texas. 



Santa Rita limestone, Silurian, New 

 Mexico. 



Saratogan =Lower Ozarkian or Upper 

 Cambrian. 



Savoy schist, Ordovician, Massachusetts. 



Scalent, Silurian, Pennsylvania. 



Schaghticoke shale, Canadian, New York. 



Schenectady beds, Trenton, New York. 



Sequatchie formation, Richmond, east 

 Tennessee. 



Sevier shale, Ordovician, Tennessee and 

 Virginia. 



Sexton Creek limestone (=Brassfield), 

 Upper Medinan, Illinois and Missouri. 



Shakopee dolomite, Canadian, Minne- 

 sota. 



Shawangunk conglomerate and grit, 

 Upper Medinan, New York, New Jer- 

 sey, and Pennsylvania. 



Sheguindah beds, Eden, Ontario. 



Shelby dolomite, Upper Niagaran, New 

 York. 



Shenandoah group, Canadian and Ordo- 

 vician, Virginia. 



Sheridan formation, Ordovician, Michi- 

 gan. 



Sheridan sandstone, Silurian, Maine. 



Sillery formation, Canadian, Quebec. 



Simpson formation, Stones River, Okla- 

 homa. 



Skajit formation, Upper Silurian, Alaska. 



Slatington shale, Silurian, Arkansas. 



Snake Hill shale, Trenton, New York. 



Sneed's limestone, Big Buffalo series, 

 Arkansas. 



Sneed ville limestone, Upper Cayugan, 

 Tennessee. 



Sodus shale, Lower Clinton, New York. 



Solomon schist, Pre-OrdoA'ician , Alaska. 



South Tunnel limestone (=Osgood), 

 Lower Niagarau, Tennessee. 



Southgate member, Eden, Ohio Valley. 



Sowik limestone, Ordovician, Alaska. 



Sparry limestone, Ordovician (?), Ver- 

 mont. 



Springfield dolomite, Upper Niagaran, 

 Ohio. 



Stewartville dolomite, Trenton, Upper 

 Mississippi Valley. 



Stissing limestone, Cambrian or Lowest 

 Ordovician, New York. 



Stockbridge limestone, Cambro-Ordovi- 

 cian, New York. 



Stone House formation, Cayugan, Nova 

 Scotia. 



Stonehenge limestone, Canadian, Penn- 

 sylvania and Maryland. 



Stones River group, Lower Chazyan. 



Stony Mountain formation, Richmond, 

 Manitoba. 



Stringtown shale, Chazyan, Arkansas. 



Sunset division of Arnheim, Richmond, 

 Kentucky and Ohio. 



Surgent, Silurian, Pennsylvania. 



Swan Creek limestone, Maysville, Ten- 

 nessee. 



Swan Peak quartzite, Ordovician, Utah. 



Swift Current limestone, Black River, 

 Ontario. 



Swift Water series, Silurian, New Hamp- 

 shire. 



Sylvan shale, Richmond, Oklahoma. 



Sylvania sandstone, Monroan, Ohio, etc. 



Syracuse shale, Lower Cayugan, New 

 York. 



Talihina chert, Ordovician, Oklahoma. 



Tatalina group, Ordovician (?), Alaska. 



Tate member, Maysville, Kentucky. 



Tatina group, Ordovician, Alaska. 



Taylors Ridge, Silurian, Georgia. 



Taylorville slate, Silurian (?), California. 



Tellico sandstone, Blount group, Ten- 

 nessee and Virginia. 



Tentaculite limestone=Manlius. 



Tetagouche series, Ordovician, New 

 Brunswick. 



Thebes formation, Richmond, Illinois 

 and Missouri. 



Theresa dolomite, Upper Cambrian or 

 Ozarkian, New York. 



Thorofare andesite, Silurian, Maine. 



Thorold sandstone, Upper Medinan, New 

 York and Ontario. 



Toll Pit beds, Silurian, Michigan. 



Tomichi limestone, Ordovician, Colo- 

 rado. 



