- Usage in publication:
-
- Hemingfordian age
- Modifications:
-
- Original reference
- AAPG geologic province:
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- Chadron arch
Summary:
Pg. 12, pl. 1. Hemingfordian age. Provincial time term, based on the Hemingford group, including the Marsland and, especially, the limited or lower Sheep Creek fauna (Cook and Cook, 1933), and not on the formation limits as extended upward (Lugn, 1939). Covers interval between Arikareean and Barstovian ages. [In middle part of Miocene; = MERYCHIPUS faunal zone.] Report defines 18 provincial time terms, based on mammal-bearing units, for North American continental Tertiary. [For sequence see under Puercan.]
Source: US geologic names lexicon (USGS Bull. 1200, p. 1730).
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).