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Shell concentrations from the Miocene Ar Rajmah Group at Soluq-Al Abyar road cut,southern Al Jabal Al Akhdar,NE Libya
Authors:Gamal M El Qot  Esam O Abdulsamad  Abdelsalam El Fakhry
Institution:1.Geology Department, Faculty of Science,Benha University,Benha,Egypt;2.Earth Sciences Department, Faculty of Science,Benghazi University,Benghazi,Libya
Abstract:The Miocene Ar Rajmah Group, exposed along the Soluq-Al Abyar road cut in southern Al Jabal Al Akhdar, NE Libya, is very rich in both micro- and macrofossils, especially molluscs and echinoids. Seven shell concentrations were recognized of which four from the Benghazi Formation; pectinidssmall oyster concentration (BSC1), Echinolampas sp.–Clypeaster cf. martini concentration (BSC2), molluscan shell concentration (BSC3), and Echinolampas cf. amplus–Clypeaster acclivis concentration (BSC4). Three shell concentrations occur in the Wadi Al Qattarah Formation; large oyster concentration (QSC1), Crassostrea gryphoidesChlamys zitteli concentration (QSC2), and Cubitostrea digitalina concentration (QSC3). The main factors controlling the formation of the shell concentrations were storm-induced waves and currents, reduced sediment input, settling behavior of benthic macro-invertebrates, and productivity.
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