Melanopsis from Al-Qarn,Jordan Valley (Gastropoda: Cerithioidea) |
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| Authors: | Klaus Bändel Naomi Sivan Joseph Heller |
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| Affiliation: | 1.Geologisch-Pal?ontologisches Institut und Museum,Universit?t Hamburg,Hamburg,Germany;2.Department of Evolution, Systematics and Ecology,The Hebrew University of Jerusalem,Jerusalem,Israel |
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| Abstract: | Fossil species ofMelanopsis from a freshwater formation in the Jordan Valley (near Al-Qarn) were investigated and the deposits containing these species are formally described as Al-Qarn Formation. Four species were found:Melanopsis buccinoidea Olivier,M. tchernovi Heller & Sivan,M. costata Olivier andM. aaronsohni Blanckenhorn.Melanopsis costata was represented by two groups, “stepped” and “non-stepped”, the latter differing in its lower figurativity index. Intermediates were found betweenM. buccinoidea andM. tchernovi; they may be hybrids. TheMelanopsis assemblage bridges the faunal gap, in the Jordan Valley, between the 2 Ma lake of ‘Erq el Ahmar on the one hand and the 0.8–1.7 Ma lake of ‘Ubeidiya on the other. This suggests an early Pleistocene age of about 1.8 million years for the Al-Qarn Formation. |
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