cf50a5b8_GPlates_Data_Manual_Table_3__Properties_Table_Used_In
[Property] gml:validTime [Optionality] Optional [Description] The period of time the feature is in existence. Consists of two variables, "begin" and "end", which are the points in time (in millions of years ago or Ma) in which the feature came in and out of existence respectively. "Begin" and "end" can also be set to "Distant Past" and "Distant Future" respectively. [Used In] 
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GPlates Data Manual
Used In