TY  - RPRT
TI  - Utility of palmatolepids and icriodontids in recognizing Upper Devonian Series, Stage, and possible substage boundaries
AU  - W. Ziegler
AU  - Charles Sandberg
PY  - 2000
UR  - https://pubs.usgs.gov/publication/70022164
ID  - 70022164
ER  -