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| Lisan Formation | |
|---|---|
| Name | Lisan Formation |
| Period | Pleistocene |
| Lithology | Marl, limestone, evaporites, tufas |
| Namedfor | Lisan Peninsula |
| Region | Dead Sea, West Bank, Israel |
| Country | Jordan, Israel, Palestine (region) |
| Subunits | Upper Lisan Member; Lower Lisan Member |
| Thickness | up to 160 m |
Lisan Formation The Lisan Formation is a Pleistocene lacustrine and evaporitic succession exposed around the Dead Sea basin and the Jordan Rift Valley. It records major fluctuations of Sea of Galilee-to-Mediterranean Sea-linked hydrology, regional tectonics associated with the Dead Sea Transform, and climatic signals relevant to studies of the Quaternary and the Last Glacial Maximum. The formation is a key stratigraphic marker used by researchers from institutions such as the Hebrew University of Jerusalem, the University of Jordan, and the Smithsonian Institution.
The Lisan sequence overlies older Pleistocene deposits related to the Hula Basin and synrift fills tied to the Dead Sea Transform. Stratigraphically it is divided into two main members commonly described as Upper Lisan Member and Lower Lisan Member, intercalated with shoreline tufas and horizonally continuous marl beds that correlate with terraces along the Jordan River and the Wadi Arabah. The contact relationships with the underlying sequences show unconformities that correspond to regional uplift episodes recorded in the stratigraphy of the Levantine basin and the structural evolution documented by studies from the Geological Survey of Israel and the Natural Resources Authority (Jordan).
Radiometric dating, including uranium-thorium methods applied at laboratories like those at the Weizmann Institute of Science and cosmogenic exposure studies from teams at Columbia University and ETH Zurich, place parts of the Lisan Formation within the late Middle to Late Pleistocene, closely associated with marine isotope stages tied to global chronologies such as those maintained by the International Stratigraphic Chart-related research consortia. Formation processes include repeated lake-level rise and drawdown episodes driven by climatic shifts recorded across the Levantine Corridor and tectonically controlled accommodation space linked to the Dead Sea Transform Fault. Correlations have been made with paleoclimate events documented in archives like the Greenland ice cores and the Speleothem records from Soreq Cave.
Lithologically the Lisan package comprises alternating marls, laminated limestones, calcitic tufa deposits, and gypsum-rich evaporites deposited under fluctuating salinity regimes similar to modern analogs such as Great Salt Lake and Lake Urmia. Sedimentological features include lamination, desiccation cracks, pisolitic textures in gypsum, and microbialite-associated fabrics comparable to those described from Mono Lake studies. Authigenic mineral assemblages—calcite, aragonite, gypsum—have been characterized in petrographic studies performed at the Hebrew University of Jerusalem and the University of Cambridge, and geochemical signatures match those found in Pleistocene evaporites from the Sahara Desert margins.
Fossil assemblages in the Lisan deposits are sparse but include molluscan remains, ostracods, and microfaunal indicators that have been analyzed by paleontologists from institutions like Tel Aviv University and the University of Oxford. Bivalve and gastropod taxa provide palaeohydrological indicators comparable to species documented in the Mediterranean Sea-influenced basins and the Caspian Sea records. Ostracod assemblages and foraminiferal relicts have been used to reconstruct salinity and temperature patterns in studies affiliated with the Geological Society of America and the Quaternary Research Association.
Paleoenvironmental reconstructions based on isotopic analyses, sedimentary facies, and biotic proxies link Lisan deposition to stadial–interstadial cycles that affected the Levantine climate and Mediterranean region. Oxygen and carbon isotope datasets produced by research groups at Ben-Gurion University of the Negev and University College London indicate episodes of hypersalinity during lowstands and fresher, lake-expanded conditions during pluvial intervals correlated with broader Pleistocene events recognized in the North Atlantic record. Tufa facies and shoreline terraces provide evidence for repeated transgression–regression cycles that have informed models of regional hydrological connectivity involving the Jordan River catchment and palaeolakes of the Fertile Crescent.
The type locality is associated with the Lisan Peninsula along the northern sector of the Dead Sea where exposures were first described by early 20th-century geologists working with the British Mandate authorities and subsequently studied by the Geological Survey of Israel and researchers affiliated with Jerusalem University College. The formation crops out along both margins of the basin, from the Wadi Zarqa outlets to the southern reaches near Ein Gedi, and extends beneath the present lake surface; subsurface data have been collected by teams from the National Oceanic and Atmospheric Administration-linked projects and regional hydrogeological surveys.
Evaporite horizons within the Lisan sequence have been targeted in studies of mineral resources analogous to extraction projects in Searles Valley and Soda Lake settings, informing potash and gypsum resource assessments carried out by the Arab Potash Company and the Dead Sea Works. The formation’s stratigraphy and aquifer relationships also bear on groundwater management, saline intrusion, and site stability analyses relevant to infrastructure planning by the Israel Water Authority and the Jordanian Ministry of Water and Irrigation. Additionally, Lisan records contribute to heritage and geo-tourism initiatives at sites like Masada and Enot Tsukim that emphasize Pleistocene landscapes.
Category:Pleistocene geology Category:Dead Sea