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North American faunal stage
The Barstovian North American Stage on the
geologic timescale is the North American
faunal stage according to the
North American Land Mammal Ages chronology (NALMA), typically set from 16,300,000 to 13,600,000 years
BP, a period of
2.7 million years.
[1] It is usually considered to overlap the
Langhian and
Serravallian stages of the
Middle Miocene. The Barstovian is preceded by the
Hemingfordian and followed by the
Clarendonian NALMA stages.
The Barstovian can be further divided into the substages of:
- late Late Barstovian: Lower boundary source of the base of the Langhian (approximate)
- early Late Barstovian: Base of the Langhian (approximate)
- early/lower Barstovian: Upper boundary source: base of Clarendonian (approximate)
Correlations
The Barstovian (15.97 to 13.6 Ma) correlates with:
References