Lebanese amber

Lebanese amber is fossilized resin found in Lebanon and southwest Syria. It is dates back approximately 130 million years to the Barremian of the Early Cretaceous. It formed on what was then the northerrn coast of Gondwana, believed to be a tropical or subtropical zone in a temperate or hot climate.[1]. Up to 300 sources of Lebanese amber have been recovered and 17 of them are important sources of organic inclusions, which are the oldest of their kind. The inclusions help to document Cretaceous fauna and flora.

Tragichrysa ovoruptora, a green lacewing larvae

Origins

Lebanese amber can be found in Lebanon and neighboring areas of Syria and north Israel. Up to 300 different sources of amber had been discovered by 2010. The amber was deposited in the Cretaceous era and is rich in fossil synclusions. 19 of the discovered sources are rich in inclusions from the Early Cretaceous. All of them are located in Lebanon, which makes it the largest source of inclusion from that period[2].

Properties

Lebanese amber can be found in a vast variety of colors such as yellow, orange, dark red or iridescent jet black. Rarely in white, milky or cream. The variation of color tone is caused by the air contained in the amber. The density of Lebanese amber is 1.054 g/cm3. It tends to be fragile and easy to damage[3].

Inclusions

Inclusions are quite common for Lebanese amber, which is rich in organisms of the Barremian epoch. Next to Jordanian amber, Lebanese amber is the oldest amber to have yielded significant invertebrate inclusions alongside the Wealden amber from the equivalently aged Wessex Formation of the UK, which is much less productive. Organisms preserved in Lebanese amber are dated back to the period prior to the angiosperm radiation, which was the period of massive extinction of old groups of arthropods, as well as the emergence of the new ones, some of which co-evolved with angiosperms. The organisms are preserved in good condition and shape[4]. The diversity and number of co-inclusions help to draw conclusions about mutual relations and co-existence.[5]

gollark: There are |ℝ| squares, right, and |ℝ²| rectangles?
gollark: Since I don't know measure theory, though, this sounds dubious.
gollark: Actually, this might be answerable with measure theory somehow.
gollark: 0% of rectangles are squares? Are you sure?
gollark: Cyber learning conditional probability, actually.

References
  1. Raif Milki, George Poinar, Lebanese Amber: The Oldest Insect Ecosystem in Fossilized Resin, 2001. ISBN 978-0-87071-533-4
  2. David I. Green, David Penney, Fossils in Amber: Remarkable Snapshots of Prehistoric Forest Life, Siri Scientific Press, 2011
  3. Andrew Ross, Amber, Harvard University Press, 1998
  4. David Penney, Biodiversity of Fossils in Amber from the Major World Deposits, Siri Scientific Press, 2010
  5. George Poinar, Life in amber, Stanford University Press, 1992
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