The Tiffanian North American Stage on the geologic timescale is the North American faunal stage

Faunal stage

In chronostratigraphy, a stage is a succession of rock strata laid down in a single age on the geologic timescale, which usually represents millions of years of deposition. A given stage of rock and the corresponding age of time will by convention have the same name, and the same boundaries.Rock...

 according to the North American Land Mammal Ages

North American Land Mammal Ages

The North American Mammal Ages establishes a geologic timescale for prehistoric North American fauna beginning 66.5 Ma during the Paleocene and continuing through to the Late Pleistocene...

 chronology (NALMA), typically set from 60,200,000 to 56,800,000 years BP

Before Present

Before Present years is a time scale used in archaeology, geology, and other scientific disciplines to specify when events in the past occurred. Because the "present" time changes, standard practice is to use AD 1950 as the origin of the age scale, reflecting the fact that radiocarbon...

 lasting . It is usually considered to overlap the Selandian

Selandian

The Selandian is in the geologic timescale an age or stage in the Paleocene. It spans the time between and . It is preceded by the Danian and followed by the Thanetian. Sometimes the Paleocene is subdivided in subepochs, in which the Selandian forms the "Middle Paleocene".-Stratigraphic...

 and Thanetian

Thanetian

The Thanetian is, in the ICS' Geologic timescale, the latest age or uppermost stratigraphic stage of the Paleocene Epoch or series. It spans the time between and . The Thanetian is preceded by the Selandian age and followed by the Ypresian age...

 within the Paleocene

Paleocene

The Paleocene or Palaeocene, the "early recent", is a geologic epoch that lasted from about . It is the first epoch of the Palaeogene Period in the modern Cenozoic Era...

. The Tiffanian is preceded by the Torrejonian

Torrejonian

The Torrejonian North American Stage on the geologic timescale is the North American faunal stage according to the North American Land Mammal Ages chronology , typically set from 63,300,000 to 60,200,000 years BP lasting . It is usually considered to overlap the Selandian and Thanetian within the...

 and followed by the Clarkforkian

Clarkforkian

The Clarkforkian North American Stage on the geologic timescale is the North American faunal stage according to the North American Land Mammal Ages chronology , typically set from 56,800,000 to 55,400,000 years BP lasting . It is usually considered to be within the Paleocene, more specifically the...

NALMA stages.

The Tiffanian is considered to contain the following substages:

• Ti6: Lower boundary source of the base of the Tiffanian (approximate).
• Ti5 Lower boundary source of the base of the Tiffanian (approximate) and upper boundary source of the base of the Clarkforkian (approximate).
• Ti4: Lower boundary source of the base of the Tiffanian (approximate) and upper boundary source of the base of the Clarkforkian (approximate).
• Ti3: Lower boundary source of the base of the Tiffanian (approximate) and upper boundary source of the base of the Clarkforkian (approximate).
• Ti2: Lower boundary source of the base of the Tiffanian (approximate) and upper boundary source of the base of the Clarkforkian (approximate).
• Ti1: Upper boundary source of the base of the Clarkforkian (approximate)