TY  - RPRT
TI  - Divisions of geologic time—Major chronostratigraphic and geochronologic units
AU  - U.S. Geological Survey Geologic Names Committee
PY  - 2010
DO  - 10.3133/fs20103059
UR  - https://pubs.usgs.gov/publication/fs20103059
ID  - fs20103059
ER  -