Omnisaura

Footprint type

Hadrosaurichnus

Alonso 1980

Hadrosaurichnus is a footprint type: the name is for the fossil footprints themselves. The animal that made them is not known for certain. Its footprints are found in rocks 72.2–66 million years old in Argentina and Peru.

Confidence labels
How sure are we?0 high4 medium5 lowHow we rate confidence

Confidence labels are switched off. Facts with low confidence, or where sources disagree, still carry a small dot: tap it for the reason.

At a glance

Data as of 11 October 2026
72.2–66 Ma
Triassic
Jurassic
Cretaceous
252 million years ago20114366

The last non-bird dinosaurs died out 66 million years ago. That's as far from us as the end of this bar.

Named by
Alonso 1980
mediummedium: Only PBDB gives this; nothing contradicts it.
Sources

Given by: Paleobiology Database. How it was chosen: PBDB leads.

Described in
R. N. Alonso (1980). Icnitas de dinosaurios (Ornithopoda, Hadrosauridae) en el Cretácico superior del norte de Argentina[Dinosaurian ichnites (Ornithopoda, Hadrosauridae) in the Late Cretaceous of northern Argentina]. Acta Geologica Lilloana 15(2): 55–63.
mediummedium: Only PBDB gives this; its author and year match the naming authority (Alonso 1980).
Sources

Given by: Paleobiology Database. The publication the Paleobiology Database gives as the authority for this genus name, usually the one that first named and described it.

Dated to
Maastrichtian, 72.2–66 million years ago
mediummedium: Only PBDB gives this; nothing contradicts it.
Omnisaura calculation72.2–66 million years ago, from its dated fossil records
lowlow: Omnisaura's calculation from only 2 dated record(s).
Sources

Given by: Paleobiology Database. How it was chosen: PBDB leads.

Found in
Argentina
lowlow: Only one PBDB record.
Peru
lowlow: Only one PBDB record.
Sources

Given by: Paleobiology Database. How it was chosen: Union of all sources (ISO 3166).

Rock formations
Vilquechicho
lowlow: Only one PBDB record.
Yacoraite
lowlow: Only one PBDB record.
Sources

Given by: Paleobiology Database. How it was chosen: Canonical names, automatic and editor-approved matches applied.

Parent group
Theropoda
mediummedium: Only PBDB gives this; nothing contradicts it.
Sources

Given by: Paleobiology Database. How it was chosen: PBDB leads.

Species named in its records
Hadrosaurichnus australis, Hadrosaurichnus titicacaensis
Sources

Given by: Paleobiology Database (the species its fossil records are identified as).

Known from
Footprints and traces
Sources

Given by: Paleobiology Database (what the name was based on).

Made by
Not known for certain. Footprints rarely show which animal made them.
Sources: Paleobiology Database (CC BY 4.0), Wikidata (CC0 1.0)Confidence levels and gaps are Omnisaura's own assessment.

Gaps are answers

What isn't known yet

  • The animal that made them: not known for certain, as for most footprint types.
  • Type species: no source we use gives it yet.
  • Order: no source we use gives it yet.
  • Family: no source we use gives it yet.
  • Common names: no source we use gives it yet.
  • What it was named after: no source we use gives it yet.
  • Held back: 1 fossil record left out: identified only tentatively (for example "cf.", "?" or the name in quotation marks).
  • Resting on one source: 3 facts come from a single source with nothing against them (rated medium): authority (PBDB); parent group (PBDB); age (headline) (PBDB).

Size and appearance aren't covered yet, and diet and way of life only as PBDB infers them for the wider group. Omnisaura leaves the rest out rather than guess.

Where sources disagree

None open. Where our sources overlap, they agree on everything shown here.

Did it meet…?

?

Same time, different places. Their fossils overlap in age, 72.2 to 66 million years ago, but no rock formation holds both.

Going by the ages and rock formations of their dated fossils, as on the map. Compare their fossil sites on the map.

Connections

Genera linked to Hadrosaurichnus by where and when their fossils were found, by classification and by who named them. Select a name to open its page.

HadrosaurichnusFound in the same rocksSame parent groupAlso found in ArgentinaAcheralichnusHadrosauropodusOrnithomimipusAgeroolithusAnteavisBoutakioutichniumByakudansauropusand 29 moreFusioolithusMegaloolithusAeolosaurusNullotitanand 19 more

Found in the same rocks 3

Genera and other fossil types from the same rock units, from rocks of overlapping age, the most shared fossil sites first.

AcheralichnusHadrosauropodusOrnithomimipus

Found in Argentina 23

Other genera found in Argentina, from rocks of overlapping age, the most fossil sites there first.

FusioolithusMegaloolithusAeolosaurusNullotitanAustroraptorIsasicursorKankNeuquensaurusRocasaurusAbelisaurusAcheralichnusArgyrosaurusArriagadoolithusBonapartenykusBonapartesaurusBonatitanand 7 more

Credits

Where this page comes from

  • Paleobiology DatabaseCC BY 4.0 · fossil records, ages, classification
  • WikidataCC0 1.0 · names and identifiers
  • OmnisauraOmnisaura editorial · confidence levels and gaps
  • PaleoMAP PaleoCoastlines (Kocsis and Scotese 2021)CC BY 4.0 · ancient coastlines on the small map
  • Natural EarthPublic domain · today's coastlines