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Almagre Arroyo (Cope)

Rio Arriba County, New Mexico
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Next site in New MexicoAMNH loc. 133 · 1 mi

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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.

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About Almagre Arroyo (Cope)

Almagre Arroyo (Cope) is a fossil collection site in Rio Arriba, New Mexico, cataloged in the Paleobiology Database. Fossils here come from the San Jose Formation, dated to the Wasatchian (56–51.1 million years ago). The depositional environment is recorded as terrestrial indet. Documented finds include Meniscotherium chamense, Hyopsodus miticulus, Esthonyx bisulcatus, Ectoganus gliriformis, Cantius frugivorus, Cantius angulatus.

Geologic setting

Formation
San Jose
Geologic interval
Wasatchian
Age
56–51.1 Ma
Depositional environment
terrestrial indet.
Recorded occurrences
12

Fossils found here

Meniscotherium chamense
Mammalia · Phenacodontidae
Hyopsodus miticulus
Mammalia · Hyopsodontidae
Esthonyx bisulcatus
Mammalia · Esthonychidae
Ectoganus gliriformis
Mammalia · Stylinodontidae
Cantius frugivorus
Mammalia · Notharctidae
Cantius angulatus
Mammalia · Notharctidae
Copelemur tutus
Mammalia · Notharctidae
Creodonta
Mammalia
Coryphodon armatus
Mammalia · Coryphodontidae
Eohippus angustidens
Mammalia · Equidae
Xenicohippus osborni
Mammalia · Equidae

Records and references

Data: Paleobiology Database collection 15430 (CC BY 4.0) — view the source record

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Questions about Almagre Arroyo (Cope)

Can you collect at Almagre Arroyo (Cope)?

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 Almagre Arroyo (Cope)?

Fossil.

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Source: Paleobiology Database.