TY  - RPRT
TI  - Planktonic marine diatom record of the past 18 m.y.: Appearances and extinctions in the pacific and southern oceans
AU  - John A. Barron
PY  - 2003
DO  - 10.1080/0269249x.2003.9705588
UR  - https://pubs.usgs.gov/publication/70222413
ID  - 70222413
ER  -