TY  - RPRT
TI  - U-Pb age of zircon crystals from the upper banner tonstein (Middle Pennsylvanian), Virginia: Absolute age of the Lower Pennsylvanian-Middle Pennsylvanian boundary and depositional rates for the Middle Pennsylvanian, central appalachian basin
AU  - P.C. Lyons
AU  - T.E. Krogh
AU  - Y.Y. Kwok
AU  - E.L. Zodrow
PY  - 1997
UR  - https://pubs.usgs.gov/publication/70019147
ID  - 70019147
ER  -