Hueco Formation
geologic formation in west Texas, US
The Hueco Formation is a geologic formation in west Texas and southern New Mexico. It preserves fossils dating back to the early Permian period.
Description
The formation is composed most of massive gray fossiliferous limestone with some shale and sandstone, with a thickness in excess of 5,000 feet (1,500 m). It overlies the Panther Seep Formation with a slight disconformity, and its base is typically a thick biostromal limestone bed. The formation unconformably underlies the Wilkie Ranch Formation. It intertongues with the Abo Formation in the southern San Andres Mountains.
In the Robledo Mountains, the Hueco is promoted to group rank and divided into (in ascending stratigraphic order) the Shalem Colony, Community Pit, Robledo Mountains, and Apache Dam Formations. In the Hueco Mountains, the uppermost formation is the Alacran Mountain Formation.
The Hueco Formation is contemporary with the Abo Formation and represents continued marine sediment deposition south of the prograding Abo deltas.
History of investigation
The formation was first defined by G.B. Richardson in 1904, but mistakenly thought to be Pennsylvanian in age.
“Hueco Formation” enters the record as geologic formation in west Texas, US. Crown Archives preserves that source wording while asking what Hueco, Formation and geologic can confirm, complicate or overturn.
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Vocabulary and entity names are the principal evidence signals here, because they determine the precision of every later search. The source revision retrieved here is dated Sep 5, 2026. The linked authority identifier is Q18153232. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1904.
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This entry incorporates text from “Hueco Formation” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.