~C.\.OLOGIC-1(
~
~ IT;
"'" "" -.I " ~ ~
~ ;. ~
. .
19011
OKLAHOMA GEOLOGICAL SURVEY
Charles J. Mankin, Director
BULLETIN 139 ISSN 0078-4389
LATE ORDOVICIAN-EARLY SILURIAN STRATA
IN THE CENTRAL UNITED STATES
AND THE HIRNANTIAN STAGE
THOMAS W. AMSDEN AND JAMES E. BARRICK
The University of Oklahoma
Norman
1986
This Oklahoma state government publication is provided for educational purposes under U.S. copyright law. Other usage requires permission of copyright holders.
~C.\.OLOGIC-1(
~
~ IT;
"'" "" -.I " ~ ~
~ ;. ~
. .
19011
OKLAHOMA GEOLOGICAL SURVEY
Charles J. Mankin, Director
BULLETIN 139 ISSN 0078-4389
LATE ORDOVICIAN-EARLY SILURIAN STRATA
IN THE CENTRAL UNITED STATES
AND THE HIRNANTIAN STAGE
THOMAS W. AMSDEN AND JAMES E. BARRICK
The University of Oklahoma
Norman
1986