Geologic formation in Lebanon
The Sannine Formation , also called the Sannine Limestone , is a Cretaceous geologic formation in Lebanon . It is a Konservat-Lagerstätte that contains a high diversity of well-preserved fish, reptiles, and invertebrates from the Tethys Ocean within its three main localities: Haqel (alternatively Hakel or Haqil), Hjoula (alternatively Hadjoula, Hajoula, or Hgula), and Nammoura (alternatively Namoura).[ 1]
It is one of three major Cretaceous lagerstätte in Lebanon, alongside the older (Barremian -aged) Lebanese amber and the younger (Santonian -aged) Sahel Aalma site. The Sannine Formation localities, combined with Sahel Alma, are together referred to as the "Fish Beds" of Lebanon.[ 1]
It is primarily Cenomanian in age, with Haqel and Hjoula being late Cenomanian, while the slightly older Nammoura site is middle Cenomanian.[ 1] Although Lebanon is now a part of Asia, the depositional environment for both formations would have been located off the coast of northern Africa during the Cretaceous, which would technically make their biota African rather than Asian.[ 2] [ 3]
The Cretaceous formations of Lebanon laterally vary from east to west; the western lowland "coastal" sequence (containing Sahel Aalma) is over 2000 metres thick and primarily consists of deep water limestone and chalk, while the eastern "mountain" sequence (containing the Sannine Formation) is 500–700 metres thick and consists of shallow water limestone.[ 4] Two different shallow-water environments are preserved by the formation: Nammoura preserves a nearshore inner continental shelf environment with significant terrestrial input, while Haqel & Hjoula preserve an outer continental shelf environment. The neritic nature of these habitats contrasts with the other major marine lagerstätte of the region, Sahel Aalma, which is thought to have been deposited in a deepwater continental slope environment.[ 1]
Modern position of the Hjoula locality compared to its Cretaceous location.
Pterosaur fossils have been recovered from the formation, including those of Mimodactylus [ 3] and Microtuban .[ 5] The pythonomorphs Pontosaurus , Eupodophis and probably Aphanizocnemus are known from the formation.[ 6] Insects are also known from compression fossils, including those of a dragonfly ,[ 7] enigmatic pond-skater like insect Chresmoda .[ 8] and a mesoblattinid cockroach.[ 9] Compression fossils of angiosperm Sapindopsis are also known. [ 10] Numerous species of fossil fish are known,[ 11] including the ionoscopid Spathiurus dorsalis [ 12] and pycnodontid Flagellipinna rhomboides .[ 13] An incredible diversity of fossil pycnodonts of various, highly unusual body plans is known, in addition to the earliest representatives of modern fish groups such as acanthomorphs , African butterflyfish and eels .[ 1]
The Sannine Formation and its fossil fishes have been known of since Roman Phoenicia . The earliest mention of them is in the Chronicon by Eusebius around 314 CE (references to earlier mentions by Herodotus are thought to be apocryphal), who mentions fossil fishes commonly being found during quarrying operations in the mountains, and cites them as evidence of the Biblical Flood . The site that these fish were recovered from is thought to correspond to the modern Haqel site. Around 1250, fossil fishes were presented to Louis IX during the Seventh Crusade and documented by Jean de Joinville , although it remains uncertain whether these originated from Haqel or the younger Sahel Alma site.[ 1] [ 14]
The first European to visit a Lebanese fossil fish locality in person was Cornelis de Bruijn in 1698, who illustrated a fossil fish that corresponds with the species Prionolepis cataphractus from Haqel. The first scientific presentation on the fossil fishes of Haqel was in 1703 at the French Academy of Sciences , and the first scientific studies were conducted by Henri Marie Ducrotay de Blainville in 1818. Lady Hester Stanhope collected and circulated fossil fishes from Haqel and Sahel Alma during the early 19th century, contributing to the study of these specimens by scientists such as Louis Agassiz . The Hadjoula site was only discovered in the late 19th century, and the Nammoura site in the early 20th century.[ 1] [ 14]
Agnathans reported from the Sannine Formation
Genus
Species
Presence
Notes
Images
Tethymyxine
T. tapirostrum
Hjoula
One of the earliest known definitive fossil hagfish .[ 15]
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^ López-Arbarello, Adriana. "The record of Mesozoic fishes from Gondwana (excluding India and Madagascar)" . Mesozoic Fishes 3 – Systematics, Paleoenvironments and Biodiversity .
^ a b c Kellner, Alexander W. A.; Caldwell, Michael W.; Holgado, Borja; Vecchia, Fabio M. Dalla; Nohra, Roy; Sayão, Juliana M.; Currie, Philip J. (2019-11-29). "First complete pterosaur from the Afro-Arabian continent: insight into pterodactyloid diversity" . Scientific Reports . 9 (1): 17875. Bibcode :2019NatSR...917875K . doi :10.1038/s41598-019-54042-z . ISSN 2045-2322 . PMC 6884559 . PMID 31784545 .
^ Walley, Christopher D. (1997). The Lithostratigraphy of Lebanon: A Review (PDF) . pp. 1–20.
^ a b Elgin, Ross A.; Frey, Eberhard (December 2011). "A new azhdarchoid pterosaur from the Cenomanian (Late Cretaceous) of Lebanon" . Swiss Journal of Geosciences . 104 (S1): 21–33. doi :10.1007/s00015-011-0081-1 . ISSN 1661-8726 . S2CID 128405107 .
^ a b c d Campbell Mekarski, Michelle; Pierce, Stephanie E.; Caldwell, Michael W. (2019-09-24). "Spatiotemporal Distributions of Non-ophidian Ophidiomorphs, With Implications for Their Origin, Radiation, and Extinction" . Frontiers in Earth Science . 7 : 245. Bibcode :2019FrEaS...7..245M . doi :10.3389/feart.2019.00245 . ISSN 2296-6463 .
^ a b c Azar, Dany; Maksoud, Sibelle; Huang, Diying; Nel, André (January 2019). "First Lebanese dragonflies (Insecta: Odonata, Aeshnoptera, Cavilabiata) from the Arabo-African mid-Cretaceous paleocontinent" (PDF) . Cretaceous Research . 93 : 78–89. Bibcode :2019CrRes..93...78A . doi :10.1016/j.cretres.2018.08.025 . S2CID 134308438 .
^ a b Nel, Andre; Azar, Dany; Martinez-Delclos, Xavier; Makhoul, Edouard (2004-03-25). "A new Upper Cretaceous species of Chresmoda from Lebanon - a latest representative of Chresmodidae (Insecta: Polyneoptera inc. sed.): first record of homeotic mutations in the fossil record of insects" . European Journal of Entomology . 101 (1): 145–151. doi :10.14411/eje.2004.019 .
^ a b P. Vršanský and E. Makhoul. 2013. Mieroblattina pacis gen. et sp. n. - Upper Cretaceous cockroach (Blattida: Mesoblattinidae) from Nammoura limestone of Lebanon . Insect Evolution in an Ambiferous and Stone Alphabet 167-172
^ D. L. Dilcher and P. W. Basson. 1990. Mid-Cretaceous angiosperm leaves from a new fossil locality in Lebanon. Botanical Gazette 151(4) :538-547
^ Forey, Peter L.; Yi, Lu; Patterson, Colin; Davies, Cliff E. (January 2003). "Fossil fishes from the Cenomanian (Upper Cretaceous) of Namoura, Lebanon". Journal of Systematic Palaeontology . 1 (4): 227–330. Bibcode :2003JSPal...1..227F . doi :10.1017/S147720190300107X . ISSN 1477-2019 . S2CID 85606708 .
^ a b El Hossny, Tamara; Maksoud, Sibelle; Azar, Dany; Saad, Pierre Abi; Cavin, Lionel (August 2020). "Spathiurus dorsalis Davis, 1887, from the Upper Cretaceous of Haqel, Lebanon, and the evolutionary history of Ionoscopiformes" . Cretaceous Research . 116 : 104619. Bibcode :2020CrRes.11604619E . doi :10.1016/j.cretres.2020.104619 . S2CID 224978290 .
^ a b Cawley, John Joseph; Kriwet, Jürgen (2019-03-04). "A new genus and species of pycnodontid fish Flagellipinna rhomboides , gen. et sp. nov. (Neopterygii, Pycnodontiformes), from the Upper Cretaceous (Cenomanian) of Lebanon, with notes on juvenile form and ecology" . Journal of Vertebrate Paleontology . 39 (2): e1614012. Bibcode :2019JVPal..39E4012C . doi :10.1080/02724634.2019.1614012 . ISSN 0272-4634 . PMC 6817322 . PMID 31709027 .
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^ Miyashita, Tetsuto; Coates, Michael I.; Farrar, Robert; Larson, Peter; Manning, Phillip L.; Wogelius, Roy A.; Edwards, Nicholas P.; Anné, Jennifer; Bergmann, Uwe; Palmer, A. Richard; Currie, Philip J. (2019-02-05). "Hagfish from the Cretaceous Tethys Sea and a reconciliation of the morphological–molecular conflict in early vertebrate phylogeny" . Proceedings of the National Academy of Sciences . 116 (6): 2146–2151. Bibcode :2019PNAS..116.2146M . doi :10.1073/pnas.1814794116 . ISSN 0027-8424 . PMC 6369785 . PMID 30670644 .
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^ Rhinochelys (Chelonioidea: Protostegidae) from the Late Cretaceous (Cenomanian) of Nammoura, Lebanon
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^ Whalen, Christopher D.; Landman, Neil H. (2022-03-08). "Fossil coleoid cephalopod from the Mississippian Bear Gulch Lagerstätte sheds light on early vampyropod evolution" . Nature Communications . 13 (1): 1107. Bibcode :2022NatCo..13.1107W . doi :10.1038/s41467-022-28333-5 . ISSN 2041-1723 . PMC 8904582 . PMID 35260548 .
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^ Jattiot, Romain; Brayard, Arnaud; Fara, Emmanuel; Charbonnier, Sylvain (January 2015). "Gladius-bearing coleoids from the Upper Cretaceous Lebanese Lagerstätten: diversity, morphology, and phylogenetic implications" . Journal of Paleontology . 89 (1): 148–167. Bibcode :2015JPal...89..148J . doi :10.1017/jpa.2014.13 . ISSN 0022-3360 .
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