TY  - RPRT
TI  - Eocene volcanism and the origin of horizon A
AU  - T. G. Gibson
AU  - K.M. Towe
PY  - 1971
DO  - 10.1126/science.172.3979.152
UR  - https://pubs.usgs.gov/publication/70010346
ID  - 70010346
ER  -