Cedar Ridge is a fossil collection site in Natrona, Wyoming, cataloged in the Paleobiology Database. The depositional environment is recorded as lacustrine - small. Documented finds include Herpetotherium fugax, Nanodelphys huntii, Copedelphys stevensoni, Leptictidae, Ankylodon annectens, Centetodon marginalis.

Geologic setting

Geologic interval: Orellan
Age: 33.9–31.8 Ma
Depositional environment: lacustrine - small
Recorded occurrences: 33

Geology notes

calcareous lens represents one of the "small playa lakes on the flood plain" within a "braided stream situation"

Locality notes

NW 1/4 sec 24 T39N R89W

Fossils found here

Herpetotherium fugax

Mammalia · Herpetotheriidae

Nanodelphys huntii

Mammalia · Peradectidae

Copedelphys stevensoni

Mammalia · Herpetotheriidae

Leptictidae

Mammalia · Leptictidae

Ankylodon annectens

Mammalia · Amphilemuridae

Centetodon marginalis

Mammalia · Geolabididae

Centetodon magnus

Mammalia · Geolabididae

Domnina gradata

Mammalia · Soricidae

Proscalops miocaenus

Mammalia · Proscalopidae

Oligoscalops

Mammalia · Proscalopidae

Micropternodus

Mammalia · Micropternodontidae

Altasciurus relictus

Mammalia · Aplodontiidae

Pelycomys placidus

Mammalia · Aplodontiidae

Cedromus wardi

Mammalia · Sciuridae

Adjidaumo

Mammalia · Eomyidae

Paradjidaumo trilophus

Mammalia · Eomyidae

Metadjidaumo hendryi

Mammalia · Eomyidae

Namatomys

Mammalia · Eomyidae

Heliscomys vetus

Mammalia · Heliscomyidae

Megaheliscomys mcgrewi

Mammalia · Heliscomyidae

Heliscomys hatcheri

Mammalia · Heliscomyidae

Scottimus ambiguus

Mammalia · Cricetidae

Eumys elegans

Mammalia · Cricetidae

Wilsoneumys planidens

Mammalia · Cricetidae

Palaeolagus burkei

Mammalia · Leporidae

Palaeolagus intermedius

Mammalia · Leporidae

Canidae

Mammalia · Canidae

Miohippus

Mammalia · Equidae

Hyracodontidae

Mammalia · Hyracodontidae

Leptomeryx evansi

Mammalia · Leptomerycidae

Hypisodus minimus

Mammalia · Hypisodontidae

Leiocephalus

Reptilia · Iguanidae

Batrachosauroides

Amphibia · Batrachosauroididae

Records and references

Data: Paleobiology Database collection 17318 (CC BY 4.0) — view the source record

Getting there

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Questions about Cedar Ridge

Can you collect at Cedar Ridge?

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 Cedar Ridge?

Fossil.

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What to bring

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Meteorite nearbyA 23.4 kg stony meteorite was found at Waltman in 1948, 28 miles from here.

Source: Paleobiology Database.