Miningg plagioclase vs omber3/31/2023 Chhibber (1934) listed 13 amber outcrops in the valley, some of which are outside the mine area described by Cruickshank and Ko (2003). Cruickshank and Ko (2003) described and mapped the locality of the amber mines that are the primary sources of the collections in the Natural History Museum, London and the American Museum of Natural History, New York. The late Albian age proposed by Cruickshank and Ko (2003) is widely cited in original and review papers on burmite (e.g., Ross et al., 2010, and references therein). Davies (Branta Biostratigraphy Ltd.) of the fossil pollen, spores, and dino fl agellates, which further indicated an age of the sediments and thus the amber as “ most likely Albian to early Cenomanian ”. Cruickshank and Ko (2003) cited unpublished reports by E.H. Cruickshank and Ko (2003) reviewed the geology of the burmite deposits, based on published and original observations, and reported an ammonite specimen taken 2 m above an amber bed at the principal mine at Noije Bum, identi fi ed as Mortoniceras, which has a stratigraphic range of Middle e Upper Albian (Wright et al., 1996). Based on 21 insect taxa found within various stages of the late Mesozoic as well as in Burmese amber, a Cenomanian age was hypothesized by Grimaldi et al. This and other evidence established a Cretaceous age for the material, corrobo- rated by expanded studies of myriad arthropod taxa in the NHML and AMNH collections (Grimaldi et al., 2002). When Alexandr Rasnitsyn of the Palaeontological Institute in Moscow examined the burmite collection in the Natural History Museum, London in 1995, he noticed the presence of some Cretaceous insect groups in this amber, notably Serphitidae and the extinct subfamily of ants Sphecomyrminae (Zherikhin and Ross, 2000). For the fi rst 80 years of its scienti fi c study, burmite was widely considered to be Eocene e Miocene in age, although Cockerell (1917) insightfully considered a Cretaceous age based on the insect inclusions. Despite its scienti fi c signi fi cance, precise dating of Burmese amber has been elusive. One of these presumably social insects is Haidomyrmex (Dlussky, 1996), arguably the most peculiar ant known (Fig. (ants) and Isoptera (termites) (Engel and Grimaldi, 2005 Engel et al., 2007).
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