1. Geological Context, Depositional Environment and Age

Geological context of Burmese amber in northern Myanmar. https://handwiki.org/wiki/index.php?curid=1616437

The amber is found within the Hukawng Basin, a large Mesozoic-Cenozoic sedimentary basin within northern Myanmar. The strata have undergone folding and faulting. The basin is considered to be a part of the West Burma Block or Burma Terrane, which has a debated tectonic history. The block was part of Gondwana during at least the Early Paleozoic, but the timing of rifting is very uncertain, with estimates ranging from the Devonian to Early Cretaceous. It is also disputed whether the block had accreted onto the Asian continental margin by the time of the amber deposition.^[1] Some members of the flora and fauna have Gondwanan affinities^[2] A recent paleomagnetic reconstruction finds that the Burma Terrane formed an island land mass in the Tethys Ocean during the Mid Creaceous at a latitude around 5-10 degrees south of the equator.^[3]

At Noije Bum, located on a ridge, amber is found within fine grained clastic rocks, typically medium to greyish green in colour, resulting from the constituent grains being black, yellow, grey and light green. The fine grained rocks are primarily fine to very fine grained sandstone, with beds of silt and shale and laterally persistent thin (1–2 mm thick) coal horizons. Massive micritic limestone interbeds of 6-8 centimetre thickness, often containing coalified plant material also occur. This facies association is typically around 1 metre thick and typically thinly bedded and laminated. Associated with the fine grained facies is a set of medium facies primarily consisting of medium to fine grained sandstones also containing thin beds of siltstone, shale and conglomerate, alongside a persistent conglomerate horizon. A specimen of the ammonite Mortoniceras has been found in a sandstone bed 2 metres above the amber horizon, alongside indeterminate gastropods and bivalves.^[4] Lead-uranium dating of zircon crystals of volcanic clasts within the amber bearing horizons has given a maximum age of 98.79 ± 0.62 Ma, making the deposit earliest Cenomanian in age.^[5] Unpublished data by Wang Bo on other layers suggests an age range of deposition of at least 5 million years.^[6] The amber does not appear to have undergone significant transport since hardening or be redeposited. The strata at the site are younging upwards, striking north north-east and dipping 50-70 degrees E and SE north of the ridge and striking between south south-east and south-east and dipping 35-60 degrees south of it, suggesting the site is on the northwest limb of a syncline plunging to the northeast. A minor fault with a conspicuous gouge zone was noted as present, though it appeared to have no significant displacement.^[4]

2. Paleoenvironment

A Puzosia (Bhimaites) species juvenile shell in Burmese amber. https://handwiki.org/wiki/index.php?curid=1167050

The Burmese amber paleoforest is considered to have been an estuarian coastal tropical rainforest where resin was subsequently transported into a brackish shallow marine environment. The presence of troglobitic nocticolid cockroaches suggests the nearby presence of caves.^[7] The shell of a dead juvenile Puzosia (Bhimaites) species ammonite, four marine gastropod shells (including Mathilda) and littoral or supralittoral isopods entombed in a piece of amber with shell sand,^[8] along with growth of Isocrinid crinoids, corals and oysters on the surface of some pieces indicate tidal zone conditions.^[9] Additionally pholadid bivalve borings into amber specimens along with at least one pholadid which became trapped show that the resin was still fresh and unhardened when it was being moved into the tidal areas.^[10]

Zigrasimecia tonsora holotype specimen. https://handwiki.org/wiki/index.php?curid=1291768

The amber itself is primarily disc-shaped and flattened along the bedding plane, and is typically reddish brown, with the colour varying from shades of yellow to red. The opacity of the amber is variable from clear to opaque. Many amber pieces have thin calcite veins that are typically less than a millimetre thick, but are up to 4–5 mm (0.16–0.20 in) wide. The number and proportion of veins in a piece of amber varies significantly, in some pieces veins are virtually absent, while others are described as being "packed with veinlets"^[4] The amber is considered to be of coniferous origin, with a likely araucarian source tree, based on spectroscopic analysis and wood fragment inclusions,^[11] though a pine origin has also been suggested.^[12]

3. Fauna and Flora

The list of taxa is extraordinarily diverse, with over 42 classes, 108 orders, 569 families, 1017 genera and 1379 species described as of the end of 2019, with over 300 species described in 2019 alone, the vast majority (94%) of which are arthropods. A complete list of taxa up until the end of 2018 can be found in Ross 2018^[13] And a supplement covering most of 2019 can be found in Ross 2019b.^[14] For the sake of brevity, a complete list of taxa is not given here, and the classification is mostly at family level. For a more complete list of taxa, see Paleobiota of Burmese amber.

3.1. Invertebrates

Well over 1000 species of invertebrates are known from the deposit, including, notably the oldest members of Palpigradi (Electrokoenenia)^[15] and Schizomida (Mesozomus)^[16] the oldest Velvet worm (Cretoperipatus)^[17] and the only known fossil members of Mesothelae and Ricinulei since the Paleozoic. Chimerarachne is a unique stem spider still possessing a tail, with similar forms only known from the Paleozoic.

Arachnids

Nephila burmanica attacking Cascoscelio incassa (Scelioninae). https://handwiki.org/wiki/index.php?curid=1334880

Araneae

Forty-four families of spiders are known from the Burmese amber, including: Archaeidae, †Burmadictynidae, †Burmascutidae, †Burmathelidae, Clubionidae, Corinnidae, †Cretaceothelidae, Deinopidae, Dipluridae, †Eopsilodercidae, †Fossilcalcaridae, Hersiliidae, Hexathelidae, †Lagonomegopidae, Leptonetidae, Liphistiidae, †Micropalpimanidae, †Mongolarachnidae, Mysmenidae, Ochyroceratidae, Oecobiidae, Oonopidae, Oxyopidae, Palpimanidae, †Parvithelidae, Pholcidae, †Pholcochyroceridae, †Plumorsolidae, †Praearaneidae, †Praeterleptonetidae, Psechridae, Psilodercidae, Salticidae, Segestriidae, Telemidae, Tetrablemmidae, Tetragnathidae, Theridiosomatidae, Theridiidae, Thomisidae, Uloboridae and †Vetiaroridae.

Acariformes

Twenty families of acariformes ae known from the Burmese amber, including: Anystidae, Archaeorchestidae, Bdellidae, Caeculidae, Cheyletidae, Enantioppiidae, Eremaeidae, Erythraeidae, Eupodidae, Gymnodamaeidae, Malaconothridae, Microtrombidiidae, Neoliodidae, Oribatellidae, Oribotritiidae, Resinacaridae, Smarididae, Trombellidae, Trombidiidae and Tuckerellidae.

Opiliones

Five families of opiliones are known from the Burmese amber, including: Epedanidae, †Halithersidae, †Monooculricinuleidae, Sclerosomatidae and Stylocellidae.

 

Cornupalpatum burmanicum. https://handwiki.org/wiki/index.php?curid=1970652

Pseudoscorpiones

Twelve families of pseudoscorpions are known from the Burmese amber, including: Atemnidae, Cheiridiidae, Cheliferidae, Chernetidae, Chthoniidae, Feaellidae, Garypinidae, Hyidae Ideoroncidae, Neobisiidae, Pseudocheiridiidae and Withiidae.

Scorpiones

Seven families of scorpions are known from the Burmese amber, including: Buthidae, Chaerilidae, †Chaerilobuthidae, †Palaeoburmesebuthidae, †Palaeoeuscorpiidae, †Palaeotrilineatidae and †Sucinolourencoidae.

Parasitiformes

Five families of parasitiformes are known from the Burmese amber, including: Argasidae, †Deinocrotonidae, Ixodidae, Opilioacaridae and Polyaspididae.

Schizomida

One genus of schizomida is known from the Burmese amber: Mesozomus, which belongs to Hubbardiidae

Palpigradi

One genus of palpigradi is known: Electrokoenenia, which belongs to Eukoeneniidae

Amblypygi

One genus of Amblypygi is known: Kronocharon, which does not belong to any extant family.

Solfugae

One genus of camel spider is known: Cushingia, which does not belong to any extant family.

Thelyphonida

Two genera of whip scorpion are known: Mesothelyphonus, which belongs to Thelyphonidae and Burmathelyphonia, which does not belong to any extant family.

Ricinulei

Three genera of Ricinulei are known: Hirsutisoma, ?Poliochera (an otherwise Carboniferous taxon) and Primoricinuleus, none of which belong to extant families

Myriapoda

Burmanopetalum inexpectatum (Callipodida). https://handwiki.org/wiki/index.php?curid=1756977

Fifteen families of Myriapods are known, including: Anthroleucosomatidae, Tingupidae, Glomeridellidae, Andrognathidae, Paradoxosomatidae, Polydesmidae, Polyxenidae, Synxenidae, Polyzoniidae, Siphoniulidae, Siphonophoridae, Siphonorhinidae, Zephroniidae, Cambalidae, Scolopendrellidae and †Burmanopetalidae.

Entognatha

Eight families of Entognathans are known, including: Campodeidae, Japygidae, Isotomidae, †Praentomobryidae, Tomoceridae, Neanuridae, Odontellidae and Sminthuridae.

Insects

Incertae cedis

A species of the enigmatic long legged insect Chresmoda is known.^[18] As is the lice-like parasite Mesophthirus.^[19]

Archaeognatha

Two families of archaeognathans are known from the Burmese amber: Machilidae and Meinertellidae

Zygentoma

One family of Zygentoman is known: Lepismatidae

Ephemeroptera

Vetuformosa buckleyi (Ephemeroptera). https://handwiki.org/wiki/index.php?curid=1788133

Seven families of mayfly are known: †Australiphemeridae, Baetidae, Ephemeridae, Heptageniidae, †Hexagenitidae, Isonychiidae, Prosopistomatidae.

Odonata

Twenty families of odonatan are known from the Burmese amber, including: Aeshnidae, †Araripegomphidae, †Burmacoenagrionidae, †Burmaeshnidae, †Burmagomphidae, †Burmaphlebiidae, Calopterygidae, Coenagrionidae, Dysagrionidae, Gomphaeschnidae, Gomphidae, Hemiphlebiidae, Libellulidae, Lindeniidae, Megapodagrionidae, †Mesomegaloprepidae, †Paracoryphagrionidae, Perilestidae, Platycnemididae, Platystictidae.

Hymenopterans

Myanmymar aresconoides (Mymaridae). https://handwiki.org/wiki/index.php?curid=1486680

Over fifty families of hymenopterans have been described beginning with the papers of Cockerell who described a group of Bethylidae and Aulacidae species between 1917–1920. The monotypic family Melittosphecidae is only known from the Burmese amber species Melittosphex burmensis and eight species belonging to Aptenoperissus of the monotypic family Aptenoperissidae are also known. Originally described as an Aneuretinae ant Burmomyrma rossi was moved to the extinct Chrysidoidea family Falsiformicidae.^[20] A number of Formicidae species known, belonging to Baikuris (indet) Camelomecia janovitzi, Ceratomyrmex ellenbergeri, 11 species of Gerontoformica, 3 species of Haidomyrmex, Linguamyrmex vladi, 2 species of Zigrasimecia, Dhagnathos autokrator, Chonidris insolita, Aquilomyrmex huangi, Protoceratomyrmex revelatus and Linguamyrmex brevicornis. Other families include Ampulicidae, Braconidae, Cephidae, Ceraphronidae, Chalcididae, Chrysididae, Crabronidae, Diapriidae, Dryinidae, Embolemidae, Evaniidae, Gasteruptiidae, Heloridae, Ichneumonidae, Megalyridae, Megaspilidae, Mymaridae, Mymarommatidae, Pelecinidae, Platygastridae, Rhopalosomatidae. Rotoitidae, Sapygidae, Scelionidae, Sclerogibbidae, Scolebythidae, Sepulcidae, Sierolomorphidae, Siricidae, Sphecidae, Stephanidae, Tiphiidae, Vespidae, Xiphydriidae, †Aptenoperissidae, †Bryopompilidae, †Burmusculidae, †Chrysobythidae, †Dipterommatidae, †Diversinitidae, †Falsiformicidae, †Gallorommatidae, †Maimetshidae, †Myanmarinidae, †Othniodellithidae, †Praeaulacidae, †Proterosceliopsidae, †Serphitidae, †Spathiopterygidae, †Syspastoxyelidae and several incertae cedis taxa.

Dipterans

Myrmeleontiformia larvae in Burmese amber. https://handwiki.org/wiki/index.php?curid=1642938

Forty-seven families of dipterans are known from the Burmese amber, including: Acroceridae, Anisopodidae, Apsilocephalidae, Apystomyiidae, Asilidae, Atelestidae, Blephariceridae, Bombyliidae, Cecidomyiidae, Ceratopogonidae, Chaoboridae, Chironomidae, Corethrellidae, Culicidae, Diadocidiidae, Dolichopodidae, Empididae, Hybotidae, Keroplatidae, Limoniidae, Lygistorrhinidae, Mycetophilidae, Mythicomyiidae, Nemestrinidae, Phoridae, Pipunculidae, Platypezidae, Psychodidae, Ptychopteridae, Rachiceridae, Rhagionidae, Scatopsidae, Sciaridae, Stratiomyidae, Tabanidae, Tanyderidae, Tipulidae, Valeseguyidae, Xylomyidae, †Cascopleciidae, †Chimeromyiidae, †Eremochaetidae, †Eucaudomyiidae, †Mysteromyiidae, †Rhagionemestriidae, †Tethepomyiidae, †Zhangsolvidae and several incertae cedis taxa.

Coleopterans

Eighty-nine families of coleopterans are known from the Burmese amber, including: Aderidae, Anthicidae, Anthribidae, †Apotomouridae, Belidae, Boganiidae, Bostrichidae, Brachypsectridae, Buprestidae, Cantharidae, Carabidae, Caridae, Cerambycidae, Cerophytidae, Cerylonidae, Chrysomelidae, Ciidae, Clambidae, Cleridae, Cucujidae, Cupedidae, Curculionidae, Cyclaxyridae, Dascillidae, Dermestidae, Drilidae, Dytiscidae, Elateridae, Elmidae, Endomychidae, Eucinetidae, Eucnemidae, Geotrupidae, Glaresidae, Gyrinidae, Histeridae, Hybosoridae, Hydraenidae, Hydrophilidae, Ithyceridae, Jacobsoniidae, Kateretidae, Laemophloeidae, Lampyridae, Latridiidae, Leiodidae, Lepiceridae, Lucanidae, Lycidae, Lymexylidae, Melandryidae, Meloidae, Melyridae, †Mesophyletidae, Monotomidae, Mordellidae, Nemonychidae, Nitidulidae, Oedemeridae, Ommatidae, Passalidae, †Parandrexidae, †Passalopalpidae, Passandridae, Prostomidae, Psephenidae, Ptiliidae, Ptinidae, Ptilodactylidae, Ripiphoridae, Rhysodidae, Salpingidae, Scarabaeidae, Scirtidae, Scraptiidae, Silphidae, Silvanidae, Smicripidae, Sphaeriusidae, Staphylinidae, Tenebrionidae, Tetratomidae, Thanerocleridae, Throscidae, Trogidae, Trogossitidae and Zopheridae.

Neuroptera

Stictosisyra pennyi (Sisyridae). https://handwiki.org/wiki/index.php?curid=1218928

Twenty-one families of neuropterans are known from the Burmese amber, including: Ascalaphidae, †Babinskaiidae, Berothidae, Chrysopidae, Coniopterygidae, †Corydasialidae, Dilaridae, †Dipteromantispidae, Hemerobiidae, Ithonidae, Kalligrammatidae, Mantispidae, †Mesochrysopidae, Myrmeleontidae, Nemopteridae, Nevrorthidae, Nymphidae, Osmylidae, Psychopsidae, Rachiberothidae, Sisyridae and several incertae cedis taxa.

Hemiptera

Sixty five families of hemipterans are known from the Burmese amber, including: Achilidae, †Albicoccidae, Aleyrodidae, Aphrophoridae, Aradidae, †Burmacoccidae, †Burmitaphidae, Callaphididae, Cercopidae, Cicadellidae, Cicadidae, Cimicidae, Cixiidae, Coccidae, Coreidae, Cydnidae, Dictyopharidae, Dipsocoridae, †Dorytocidae, Enicocephalidae, Fulgoridae, Gelastocoridae, Gerridae, †Hodgsonicoccidae, Hydrometridae, Issidae, †Jubisentidae, †Juraphididae, Kinnaridae, †Kozariidae, †Lalacidae, Leptopodidae, †Liadopsyllidae, Margarodidae, Matsucoccidae, †Mimarachnidae, †Minlagerrontidae, Miridae, Monophlebidae, Naucoridae, Ochteridae, Ortheziidae,†Palaeoleptidae, †Parvaverrucosidae, †Perforissidae, †Protopsyllidiidae, †Procercopidae, Pseudococcidae, Reduvidae, Schizopteridae, †Sinoalidae, †Tajmyraphididae, Tettigarctidae, Tingidae, Tropiduchidae, Velocipedidae, Veliidae, †Weitschatidae, Xylococcidae, †Yetkhatidae, Nabidae, †Neazoniidae and several incertae cedis taxa.

Dictyoptera

Twenty families of dictyopterans are known from the Burmese amber, including: Blaberidae, †Blattulidae, Blattidae, †Caloblattinidae, Corydiidae, Ectobiidae, †Olidae, †Liberiblattinidae, †Alienopteridae, †Manipulatoridae †Umenocoleidae , Nocticolidae, †Pabuonqedidae Termites (†Archeorhinotermitidae, Hodotermitidae, Termitidae and Mastotermitidae) and mantid Burmantis.

Mecoptera

Five families of mecopteran are known, including: Bittacidae, Meropeidae, Mesopanorpodidae, †Pseudopolycentropodidae and †Dualulidae.

Psocoptera

Nine families of psocopteran are known, including: †Archaeatropidae, Compsocidae, Liposcelididae, Manicapsocidae, Pachytroctidae, Prionoglarididae, Psyllipsocidae, Sphaeropsocidae and Trogiidae.

Orthoptera

Six families of orthopteran are known, including: †Elcanidae, Gryllidae, Mogoplistidae, Tetrigidae, Tettigoniidae and Tridactylidae

Trichoptera

Eight families of trichopteran are known, including: Calamoceratidae, †Dysoneuridae, Helicopsychidae, Hydroptilidae, Odontoceridae, Philopotamidae, Polycentropodidae and Psychomyiidae.

Dermaptera

Astreptolabis laevis. https://handwiki.org/wiki/index.php?curid=1400596

Five families of dermapteran are known, including: Anisolabididae, Diplatyidae, Labiduridae and Pygidicranidae.

Embioptera

Four families of embiopteran are known, including: Clothodidae, Oligotomidae, Notoligotomidae and †Sorellembiidae.

Notoptera

One species of notopteran is known, a nymph ice crawler (Grylloblattidae) Sylvalitoralis cheni.^[21]

Strepsiptera

Four families of strepsipteran are known, including: †Cretostylopidae, †Kinzelbachillidae, †Mengeidae, †Phthanoxenidae

Lepidoptera

Four families of lepidopteran are known, including: Douglasiidae, Gelechiidae, Gracillariidae and Micropterigidae.

Megaloptera

One species of megalopteran is known, Haplosialodes liui of the family Sialidae.

Phasmatodea

Four families of phasmatodean are known: †Archipseudophasmatidae, Phasmatidae. †Pterophasmatidae and Timematidae

Rohrthrips jiewenae. https://handwiki.org/wiki/index.php?curid=1872448

Thysanoptera

Four families of thrips are known, including: Aeolothripidae, †Rohrthripidae, Thripidae and Stenurothripidae.

Largusoperla billwymani, a member of Plecoptera. https://handwiki.org/wiki/index.php?curid=1375574

Plecoptera

Two families of stoneflies are known, Perlidae and †Petroperlidae.

Raphidioptera

One family of Raphidiopteran is known, †Mesoraphidiidae.

†Tarachoptera

One family of Tarachopteran is known: †Tarachocelidae

†Permopsocida

One family of Permopsocidan is known: †Archipsyllidae

Zorotypus pecten. https://handwiki.org/wiki/index.php?curid=1179290

Zoraptera

Multiple species of Zorotypus and the monotypic genus Xenozorotypus are known.

Nematoda

Five families of nematodes are known, including: Cosmocercidae, Heterorhabditidae, Mermithidae, Thelastomatidae, Aphelenchoididae

Nematomorpha

One genus of nematomorph is known: Cretachordodes (Chordodidae, Gordioidea)

Mollusca

Shell of Archaeocyclotus, a member of Cyclophoridae. https://handwiki.org/wiki/index.php?curid=1217853

Aside from the previously mentioned ammonites and marine gastropod shells, Seven families of terrestrial gastropod are known: Diplommatinidae, Pupinidae, Achatinidae, Punctidae, Valloniidae, Assimineidae and Cyclophoridae^[22][23][24]

3.2. Vertebrates

 

CT scan of mummified bird wing in amber. https://handwiki.org/wiki/index.php?curid=1715900

While the deposit is well known for invertebrate inclusions, some vertebrate inclusions have been found as well. One of the more notable discoveries was a well preserved theropod dinosaur tail, with preserved feathers.^[25] As well as fossils of enantiornithine birds including juveniles^[26][27] and partial wings and preserved feet,^{[28][29][30][31]} including a diagnostic taxon, Elektorornis.^[32] A complete skull of the bizarre avialan or lizard Oculudentavis is known.^[33] Electrorana is a well preserved frog known from the amber.^[34] Other notable specimens include an embryonic snake.^[35] Several species of lizard were described from the deposit including a gecko with preserved toe pads (Cretaceogekko).^[36][37] One of the specimens was initially described to be a chamelonid, actually turned out to be an albanerpetonid amphibian.^[38]

Radula cretacea. https://handwiki.org/wiki/index.php?curid=1535762

3.3. Flora

Angiosperms

Eleven species of Angiosperm are known in nine genera, including members of Cornaceae, Cunoniaceae, Lauraceae, ?Monimiaceae and Laurales incertae cedis. Poales incertae cedis and Angiosperm incertae cedis.

Bryopsida

Two genera of Bryopsida in the separate orders Dicranales and Hypnodendrales

Jungermanniopsida

Three families of Jungermanniopsida are known, Frullaniaceae, Lepidolaeanaceae, Radulaceae.

Cystodium sorbifolioides. https://handwiki.org/wiki/index.php?curid=1849175

Pinophyta

Two families of Pinopsida are known: Araucariaceae and Cupressaceae including Metasequoia.

Pteridopsida

Four families of Pteridopsidan are known: Cystodiaceae, Dennstaedtiaceae, Lindsaeaceae, Pteridaceae and several genera of Polypodiales incertae cedis.

3.4. Amoebozoa

Myxogastria

Sporocarps of extant myxogastrid slime mould genus Stemonitis are known.^[39]

Dictyostelia

A possible dictyostelid Paleoplastes burmanica has been described.^[40]

4. History

The amber is apparently referred to in ancient Chinese sources as originating from Yunnan Province as early as the first century AD according to the Book of the Later Han and trade with China had been ongoing for centuries. It was first mentioned in European sources by the Jesuit Priest Álvaro Semedo who visited China in 1613, it was described as being "digged out of mines, and sometimes in great pieces, it is redder than our amber though not so cleane".^[41] The locality itself has been known to European explorers since the 1800s with visitation to the Hukawng Valley by Simon Fraser Hannay in 1836–1837.^[42][43] At that time the principle products of the valley mines were salt, gold, and amber, with the majority of gold and amber being bought by Chinese traders. Hannay visited the amber mines themselves on March 21, 1836, and he noted that the last three miles to the mines were marked with numerous abandoned pits, up to 15 ft (4.6 m) in depth, where amber had been dug in the past. The mining had moved over the hill to a series of 10 pits but no visible amber was seen, suggesting that miners possibly hid the amber found that day before the party arrived. Mining was being performed manually at the time through the use of sharpened bamboo rods and small wooden shovels. Finer pieces of amber were recovered from the deeper pits, with clear yellow being recovered from depths of 40 ft (12 m) The recovered amber was bought with silver or often exchanged for jackets, hats, copper pots, or opium among other goods. mixed and lower quality amber was sold from around 1/ ticals to 4 rupees per seer. Pieces that were considered high quality or fit or use as ornamentation were described as expensive and price varied depending on clarity and color. Women of the valley were noted to wear amber earrings as part of their jewelry.^[42] In 1885 the Konbaung dynasty was annexed to the British Raj and a survey of the area was conducted by Dr. Fritz Noetling on behalf of the Geological Survey of India.^[41] The final research before Burmese independence in 1947 was conducted by Dr. H.L. Chhibber in 1934, who provided the most detailed description of Burmite occurrences.^[41]

5. History of Research

The first research on the inclusions in the Burmese amber was published in 1916 by Theodore Dru Alison Cockerell, who initially concluded that the amber was Miocene in age. However, he subsequently noted the archaic nature of the insects, and concluded that the amber must be older.^[41]

6. Modern Exploitation and Controversy

A small Canadian mining firm controlled the deposit from the mid 1990s to c. 2000, though the history of exploitation during the 2000s and early 2010s is obscure. The deposit is apparently currently controlled by the Burmese Military, which took over the mines in June 2017 from the Kachin Independence Army.^[44] The working conditions at the mines have been described as extremely unsafe, down 100 m (330 ft) deep pits barely wide enough to crawl through, with no accident compensation. The presence of calcite veins are a major factor in determining the gem quality of pieces, with pieces with a large number of veins having significantly lower value.^[4] Most of the Amber from the mines appears to be smuggled into China to be sold, and sales of amber have been alleged to help fund the Kachin conflict by various news organisations in 2019.^[6][45][46] Interest in this discussion rose in 2020 after the highly publicised description of Oculudentavis, which made the cover of Nature.^[47] On April 21st, 2020 the Society of Vertebrate Paleontology (SVP) published a letter of recommendation to journal editors discouraging them from publishing studies on burmese amber material.^[48] On April 23rd, 2020 Acta Palaeontologica Polonica stated that it would not accept papers on Burmese amber material collected from 2017 onwards, after the Burmese millitary took control of the deposit, requiring "certification or other demonstrable evidence, that they were acquired before the date both legally and ethically".^[49] On May 13th, 2020, the Journal of Systematic Palaeontology published an editorial stating that it would no longer consider papers based whole or in part on Burmese amber material, regardless of whether in historic collections or not.^[50]

7. Other Myanmar Ambers

Other deposits of amber are known from several regions in Myanmar, with noted deposits in the Shwebo District of the Sagaing Region, from the Pakokku and Thayet districts of Magway Region and the Bago District of the Bago Region.^[43][51] Unlike the Hukawng deposit, none of the other sources have produce notable quantities of amber. A 2018 study on an amber deposit from Tilin in central Myanmar indicated that deposit to be 27 million years younger than the Hukawng deposit, dating to approximately 72 million years old, placing it in the latest Campanian age. Within a number of arthropod specimens were described though much more poorly preserved than specimens in the Hukawng amber. These include members of Hymenoptera (Braconidae, Diapriidae, Scelionidae) Diptera (Ceratopogonidae, Chironomidae) Dictyoptera (Blattaria, Mantodea) planthoppers, Berothidae and bark lice (Lepidopsocidae) as well as extant ant subfamilies Dolichoderinae and tentatively Ponerinae, as well as fragments of moss.^[52]