Lance Formation: References & Edit History
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Article History
| Type | Description | Contributor | Date |
|---|---|---|---|
| Invalidated site: United States Geological Survey - The Lancet Formation-Petrography and Stratigraphy, Powder River Basin and Nearby Basins, Wyoming and Montana. | Jan 30, 2020 | ||
| Add new Web site: United States Geological Survey - The Lancet Formation-Petrography and Stratigraphy, Powder River Basin and Nearby Basins, Wyoming and Montana. | Apr 17, 2018 | ||
| Media added. | Feb 24, 2011 | ||
| Updated geologic time data. | May 20, 2010 | ||
| Article revised and updated. | Jan 19, 2007 | ||
| Article added to new online database. | Jul 20, 1998 |
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