TY  - BOOK
AU  - Shrock,Robert Rakes
TI  - Sequence in layered rocks : : a study of features and structures us eful for determining top and bottom or order of succession in bedded an d tabular rock bodies / 
U1  - 552 SHR 
PY  - 1948///
CY  - New York : 
PB  - McGraw-Hill Book Co. , 
KW  - Rocks
KW  - Field work
KW  - Geology, Structural
KW  - Geology
ER  -