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Ammonites of the Cretaceous Ieru Formation, western Papua New Guinea

Created 17/10/2025

Updated 17/10/2025

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Eleven ammonite species from five localities in the Ieru Formation, western Papua New Guinea, are described. Four are identified with the well known and widely distributed Cenomanian species of the Acanthoceratidae, Calycoceras (Newboldiceras) newboldi (Kossmat), C. (N.) cf orientale Matsumoto and others, C. (N.) annulatum Collignon and Acanthoceras rhotomagense (Brongniart). Other Cenomanian taxa are three indeterminable acanthoceratid species, C. (Calycoceras) sp. nov .(?), Calycoceras subgenus et sp. indet., and Acanthoceras sp. indet., as well as Pachydesmoceras sp. nov. and Chimbuites aff. mirindowensis Wright. The Turonian species Romaniceras deverioides (de Grossouvre) was found with Placenticeras aff. tamulicum (Blanford); several fragments, probably from the Star Mountains, are also referred to P. aff. tamulicum.

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Field Value
Title Ammonites of the Cretaceous Ieru Formation, western Papua New Guinea
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/60eee4a8-787a-4916-8963-75f7ade521e4
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        141.08,
        -6.26
      ],
      [
        143.76,
        -6.26
      ],
      [
        143.76,
        -3.99
      ],
      [
        141.08,
        -3.99
      ],
      [
        141.08,
        -6.26
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Ammonites of the Cretaceous Ieru Formation, western Papua New Guinea". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/ammonites-of-the-cretaceous-ieru-formation-western-papua-new-guinea