Miacis

via iDigBio · CC0 · via iDigBio. May be a photograph of a specimen, or an artist’s reconstruction — an interpretation of a skeleton, since colour and soft tissue are almost never preserved.
On record
Recorded, not inferred- Sits inside
- CarnivoraformesPBDB
- Diet
- insectivorePBDB, for Theria
- Life habit
- arborealPBDB
- Motility
- actively mobilePBDB, for Osteichthyes
- Environment
- terrestrialPBDB, for Eutheria
Time the record covers
At least 14 million years on record.
The record covers at least 51.1 Mya to 37 Mya. No occurrence read is dated outside 56 Mya to 27.3 Mya.
154 occurrences of Miacis on record, most of them in the Eocene. Bar height is expected occurrences, not a count: each fossil is spread across the span it is dated to, so a tall narrow bar means tight dating and a low wide one means loose.
When
154 occurrencesThese are dates about fossils, not the animal: the record can only begin after it arose and end before it died out, so either end may reach further. Shares are expected occurrences: a fossil dated to a span is counted partly in each period it straddles. More on what this infers.
Found in
30 formations
- Willwood Formation68
- Wind River Formation18
- Wasatch Formation15
- DeBeque Formation7
- Bridger Formation7
- Washakie Formation5
Loading coastlines…
The named rock units Miacis has been recovered from, largest first. Drawn where the rock is now, not where it formed. 6 further formations hold fewer occurrences each and are not listed. 1 occurrence has no formation on record, which is common for older literature.
Miacis and its relatives
EoceneWhere Miacis and its relatives were recorded in the Eocene.
Found in the same rock
1,253 taxa- Phenacodus vortmani46 sites
- Diacodexis metsiacus39 sites
- Coryphodon37 sites
- Esthonyx bisulcatus37 sites
- Paramys copei36 sites
- Hyopsodus35 sites
- Viverravus acutus34 sites
- Cantius abditus31 sites
- Haplomylus speirianus29 sites
- Sifrhippus grangeri28 sites
- Vulpavus australis28 sites
- Homogalax protapirinus26 sites
- Thryptacodon antiquus26 sites
- Cantius mckennai25 sites
- Heptodon calciculus25 sites
- Phenacodus25 sites
- Phenacolemurinae25 sites
- Didymictis protenus24 sites
- Hyopsodus loomisi24 sites
- Arenahippus pernix23 sites
- Diacodexis21 sites
- Prototomus21 sites
- Bunophorus20 sites
- Didymictis20 sites
The Paleobiology Database records 138 sites for Miacis, and this reads all of them. The number is how many of those sites it was catalogued from too. The 24 sharing the most are listed.
This is not a list of everything alive at the time. It is only what has come out of the same ground as this animal and been written down.
Entered from
52 references- Stratigraphy and mammalian paleontology of the McCullough Peaks, northern Bighorn Basin, Wyoming: Implications for biochronology, basin development, and community reorganization across the Paleocene-Eocene boundary38
- Synonymies and reidentifications of North American fossil mammals19
- Revision of the Wind River faunas, early Eocene of central Wyoming. Part 5. Geology and biostratigraphy of the upper part of the Wind River Formation, northeastern Wind River Basin12
- Paleocene-Eocene faunal zones and a preliminary analysis of Laramide structural deformation in the Clarks Fork Basin, Wyoming8
- Fossil Mammalia from the early Wasatchian Four Mile fauna, Eocene of northwest Colorado8
- Distribution and stratigraphic correlation of upper Paleocene and lower Eocene fossil mammal and plant localities of the Fort Union, Willwood, and Tatman formations, southern Bighorn Basin, Wyoming6
- Early Eocene Mammalian Fauna of the Piceance Creek Basin. Northwestern Colorado5
- Mammalian Fauna From the Lower Bridger Formation (Bridger A, Early Middle Eocene) of the Southern Green River Basin, Wyoming4
- The Eocene Vertebrates of the Uinta Basin, Utah3
- Carnivorous mammals from the middle Eocene Washakie Formation, Wyoming, USA, and their diversity trajectory in a post-warming world2
- Fossil mammals and the age of the Changxindian Formation, Northeastern China2
- Biostratigraphy and magnetostratigraphy of the Bridgerian-Uintan Washakie Formation, Washakie Basin, Wyoming2
Each of the 154 occurrences read was entered from one of these publications, ordered by how many each accounts for. This is not a search for papers mentioning the name. 40 further references are not listed. Entries link to doi.org where the Paleobiology Database holds an identifier, and to its own record where it does not. Relayed as the Paleobiology Database holds them, not checked against what they resolve to.
Media and terms
Media content2

Picture of Miacis
- Source
- iDigBio
- Credit
- via iDigBio
- Licence
- CC0
- Commercial use
- the licence allows it
Structured light scan
- Source
- MorphoSource
- Licence
- In Copyright
- Commercial use
- cannot be read from the licence given — check the record
- Specimen
- Miacis latidens · FMNH:P:26875
This is what the site found, which is not the same as what exists.
Keep going
What may have been alongside itCarnivoraformes through timeFormations of the EoceneThe world it lived on
Occurrence data from the Paleobiology Database, CC BY 4.0. Cope 1872