TY  - RPRT
TI  - Age of biostratigraphic horizons within the Ordovician and Silurian systems
AU  - Michael J. Kunk
AU  - J. Sutter
AU  - J. D. Obradovich
AU  - Marvin A. Lanphere
PY  - 1985
DO  - 10.1144/gsl.mem.1985.010.01.10
UR  - https://pubs.usgs.gov/publication/70207636
ID  - 70207636
ER  -