TY  - RPRT
TI  - Divisions of geologic time—Major chronostratigraphic and geochronologic units
AU  - U.S. Geological Survey Geologic Names Committee
PY  - 2007
DO  - 10.3133/fs20073015
UR  - https://pubs.usgs.gov/publication/fs20073015
ID  - fs20073015
ER  -