, Volume 24, Issue 1, pp 25–37 | Cite as

Evidence for shallow-marine origin of a ‘Monterey-formation type’ chert-phosphorite-dolomite seqence: Amman formation (Late cretaceous), Central Jordan

  • Abdulkader M. Abed
  • Ghazi M. Kraishan


The late Cretaceous Amman Formation in central Jordan consists of cherts, porcelanites, dolomites and phosphorites with various limestones types. It is subdivided into five mapable lithological units: Mixed Mineralogy Unit, Porcelanite Unit, Chalk Unit, Main Chert Unit and Phosphorite Unit. The microfacies indicates a deposition within a shallow-marine inner epicontinental shelf environment ranging from supratidal to deep subtidal. The depositional model of the Amman Formation differs, therefore, from that of the Monterey Formation which is generally regarded as a model for a phosphorite-chertdolomite association formed in deeper outer shelf and slope environments. Cherts and porcelanites are of biogenic origin, they were formed by an early diagenetic replacement of lime mudstones and lime packstones.


Facies Analysis Cherts, Porcelanites, Dolomites Jordan Late Cretaceous 

Eine Chert-Phosphorit-Dolomit-Abfolge flachmariner Entstehung vom ‘Monterey-Typ’: Amman Formation (Oberkreide), Zentraljordanien


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Copyright information

© Institut für Paläontologie, Universität Erlangen 1991

Authors and Affiliations

  • Abdulkader M. Abed
    • 1
  • Ghazi M. Kraishan
    • 1
  1. 1.Department of Geology and MineralogyUniversity of JordanAmmanJordan

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