@misc{indiciaebe36bfefbee9, title = {Divisions of geologic time—Major chronostratigraphic and geochronologic units}, author = {Randall C. Orndorff and Nancy R. Stamm and David R. Soller and Lucy E. Edwards and Julie A. Herrick and Leslie F. Ruppert and Janet L. Slate and Berry H. Tew}, year = {2023}, doi = {10.3133/pp1879v1c}, url = {https://pubs.usgs.gov/publication/pp1879v1C}, note = {Source identifier: pp1879v1C} }