20 



NEW YORK STATE MUSEUM 



-lo' 



7 



24' 



6 



8' 



5 



3' 



4 



2' 



3 



60' 



2 



2d Guelph fauna; upper Shelby dolomite 



Lockpprt dolomites 



ist Guelph fauna; lower Shelby dolomite 



I^LockpOrt dolomites largely covered 



Rochester shale 



Immediately above the Rochester shale, there are 62 feet of Lock- 

 port dolomite with its characteristic fauna. Then in the next 3 

 feet is the first appearance of the Guelph fauna. This is succeeded 

 by 32 feet of Lockport dolomite with its characteristic fauna and 

 finally above this, in the 8 to 10 feet of dolomite, is the second 

 appearance of the Guelph fauna. The dolomite containing the 

 upper Guelph fauna completes the section at Shelby, the interval 

 to the Pittsford shale not being shown. 



In Monroe county the.Salina appears to follow just above the last 

 appearance of the Guelph fauna as there known. It should be 



