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Hettangian Stage: References & Edit History
Article Contributors
Primary Contributors
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Carol Marie Tang
Senior Science Educator, California Academy of Sciences, San Francisco.
Other Encyclopedia Britannica Contributors
Article History
Type | Description | Contributor | Date |
---|---|---|---|
New text added that updates the interval's boundary years. | May 06, 2013 | ||
Deleted Web site: GeoWhen Database - Hettangian. | May 01, 2013 | ||
Added Jurassic Period geologic time scale. | Jul 07, 2011 | ||
Article revised and updated. | Jan 19, 2007 | ||
Article added to new online database. | Jul 20, 1998 |
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