Summary
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.
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Abed, A.M., Kraishan, G.M. Evidence for shallow-marine origin of a ‘Monterey-formation type’ chert-phosphorite-dolomite seqence: Amman formation (Late cretaceous), Central Jordan. Facies 24, 25–37 (1991). https://doi.org/10.1007/BF02536839
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DOI: https://doi.org/10.1007/BF02536839