Category:Geology of the United States by geochronology
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Countries of North America: The Bahamas · Canada · Costa Rica · El Salvador · Guatemala · Mexico · Nicaragua · Panama · United States of America‡
‡: partly located in North America
‡: partly located in North America
![](https://upload.wikimedia.org/wikipedia/commons/thumb/2/22/Geologic_time_scale.jpg/250px-Geologic_time_scale.jpg)
Subcategories
This category has the following 47 subcategories, out of 47 total.