*** Required fields are in red ***
Existing units - full reference to first definition and any revisions;
Proposed units - reference to planned publication containing their description
Age: maximum and minimum age in chronostratigraphic units as precisely as possible
Click to expand/contract/select age. From keyboard, use right/left arrow to expand/contract tree, up/down arrow and Enter to select/deselect age.
Select age from age tree. After selecting age,
click appropriate button (Min Age / Max Age) to make your entry.
Directly enter max age and min age.
Or absolute age if known (with error, material, method, and technique)