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Placerias Quarry, UCMP A269

Apache County, Arizona
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Based on our latest records, with claims updated from the BLM on Oct 9, 2026. Land and claims can change quickly, so check before you go.

Minerals on record here

1 mineral

Recorded here: fossil.

Nearby sites

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8 miKrzyzanowski Bonebed, NMMNH L-3764Fossil8 miSt Johns, KraterokheirodonFossil8 miRound Rock 1 (UCMP A271)Fossil

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About Placerias Quarry, UCMP A269

Placerias Quarry, UCMP A269 is a fossil collection site in Apache, Arizona, cataloged in the Paleobiology Database. Fossils here come from the Chinle Formation, dated to the Norian (227.3–205.7 million years ago). The depositional environment is recorded as wet floodplain. Documented finds include Placerias hesternus, Desmatosuchus spurensis, Smilosuchus adamanensis, Archosauria, Postosuchus kirkpatricki, Anaschisma browni.

Geologic setting

Formation
Chinle
Geologic interval
Norian
Age
227.3–205.7 Ma
Depositional environment
wet floodplain
Recorded occurrences
76
Geology notes

"a soft, vegetated pond bottom or other quiet water deposit"; "ancient pond or marsh, an environment of low-energy water flow that may have been seasonally low or dry (as indicated by numerous evaporites." But re-interpreted as a humid-environment soil.

Locality notes

grassy valley near Romero Spring, approx. 10.5 km SW of St. Johns, eastern Apache County. In SW 1/4, NW 1/2, sec 14, T12N, R27E, near W edge of a low terrace along a tributary arroyo of Big Hollow Wash, at UTM 641260E, 3811730N, zone 12.

Fossils found here

Placerias hesternus
Osteichthyes · Stahleckeriidae
Desmatosuchus spurensis
Reptilia · Stagonolepididae
Smilosuchus adamanensis
Reptilia · Parasuchidae
Archosauria
Reptilia
Postosuchus kirkpatricki
Reptilia · Rauisuchidae
Anaschisma browni
Amphibia · Metoposauridae
Camposaurus arizonensis
Reptilia · Coelophysidae
Calyptosuchus wellesi
Reptilia · Stagonolepididae
Phoebodus
Chondrichthyes · Phoebodontidae
Triodus moorei
Chondrichthyes · Xenacanthidae
Lonchidion humblei
Chondrichthyes · Lonchidiidae
Chondrichthyes
Chondrichthyes
Ceratodus
Osteichthyes · Ceratodontidae
Coelacanthidae
Osteichthyes · Coelacanthidae
Cionichthys
Actinopterygii · Redfieldiidae
Redfieldiidae
Actinopterygii · Redfieldiidae
Gyrolepis
Actinopterygii · Palaeoniscidae
Semionotidae
Osteichthyes · Semionotidae
Lasalichthys
Actinopterygii · Redfieldiidae
Osteichthyes
Osteichthyes
Sphenodontidae
Reptilia · Sphenodontidae
Shuvosaurus inexpectatus
Reptilia · Shuvosauridae
Poposaurus gracilis
Reptilia · NO_FAMILY_SPECIFIED
Phytosauria
Reptilia
Dinosauriformes
Reptilia
Trilophosaurus jacobsi
Reptilia · NO_FAMILY_SPECIFIED
Trilophosaurus
Reptilia · NO_FAMILY_SPECIFIED
Cynodontia
Osteichthyes
Tanytrachelos
Reptilia · Tanystropheidae
Turseodus
Actinopterygii · Palaeoniscidae
Herrerasauridae
Saurischia · Herrerasauridae
Apachesaurus gregorii
Amphibia · Metoposauridae
Saurischia
Saurischia
Tecovasaurus murryi
Reptilia · NO_FAMILY_SPECIFIED
Theropoda
Reptilia
Archosauriformes
Reptilia
Dromomeron gregorii
Reptilia · Lagerpetidae
Acaenasuchus geoffreyi
Reptilia · Stagonolepididae
Vancleavea campi
Reptilia · Doswelliidae
Acrodus
Chondrichthyes · Acrodontidae
Uatchitodon schneideri
Reptilia · NO_FAMILY_SPECIFIED
Pterosauria
Reptilia
Leptosuchus
Reptilia · Parasuchidae
Procolophonidae
Reptilia · Procolophonidae
Drepanosauridae
Reptilia · Drepanosauridae
Krzyzanowskisaurus hunti
Ornithischia · NO_FAMILY_SPECIFIED
Tecovasuchus chatterjeei
Reptilia · Stagonolepididae
Tecovasuchus
Reptilia · Stagonolepididae

Showing 48 of 62 identified taxa.

Records and references

Data: Paleobiology Database collection 39160 (CC BY 4.0) — view the source record

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Questions about Placerias Quarry, UCMP A269

Can you collect at Placerias Quarry, UCMP A269?

It depends on who owns the land and whether a mining claim covers it. BLM land usually allows hand collecting for personal use, national parks allow none, and private land needs the owner’s permission. Pro members see the owner and any claims at this spot.

What minerals are found at Placerias Quarry, UCMP A269?

Fossil.

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Source: Paleobiology Database.