UABTON.] KEY TO SUBJECT ENTRIES. i) 



New York, Pennsylvania, New Jersey, 



Southern Appalachians (Maryland to Alabama). 



Lakes Superior, Michigan, and Huron region. 



Dakota, Iowa, Nebraska. 



Missouri. 



Texas. 



Eocky Mountains to Pacific coast. 



Canada (excepting adjoining Lake Superior). 

 Carboniferous, with subheadings as follows : 



New England. 



New York, Pennsylvania, Maryland, Virginia. 



Ohio. 



Kentucky, Tennessee, Alabama, Georgia, 



Michigan. 



Illinois, Indiana. 



Iowa, Nebraska, Kansas, Missouri, Arkansas, Indian Territory, 

 Texas. 



Eocky Mountains to the Pacific coast. 



Canada (including all of British America). 



General. 

 Cretaceous, with subheadings as follows : 



Atlantic coast region. 



Gulf region (Alabama to Louisiana to Kentucky). 



Dakota and Minnesota to Texas. 



Eocky Mountains to Great Basin region. 



Pacific States. 



Canada. 



General. 

 Devonian, with subheadings as follows : 



New England, 



Appalachian (New York to Alabama). 



West of Appalachians to the Mississippi and Minnesota. 



wWt of the Mississippi, excepting Minnesota. 



Canada (including all of British America). 



General. 

 Juratrias, with subheadings as follows: 



Massachusetts to North Carolina. 



Eastern Canada. 



Dakota to Texas. 



Eocky Mountain region. 



California to Washington. 



Western Canada and Alaska. 



General. 

 Pleistocene, with subheadings as follows : 



New England. 



New York. 



Pennsylvania. 



