Tanaing Amber Mine, Hukawng Valley (Cretaceous of Myanmar)

Where: Kachin, Myanmar (26.3° N, 96.6° E: paleocoordinates 12.3° N, 93.9° E)

• coordinate stated in text

• outcrop-level geographic resolution

When: Early/Lower Cenomanian (99.6 - 93.5 Ma)

• "A mid-Cretaceous age has been assigned to both the amber and surrounding rock. There are thousands of arthropods in the amber considered to be from the Turonian– Cenomanian, as well as a specimen of the ammonite Mortoniceras (Middle-Upper Albian) and distinctive palynomorphs (Upper Albian to Lower Cenomanian) from the amber-bearing horizon, among many other biological inclusions. A recent study using U-Pb dating of zircons in amber-bearing rock refined the date to 98.79 Ma ± 0.62 Ma. This date was further verified by a newly-discovered Late Albian–Early Cenomanian ammonite, Puzosia (Bhimaites), found among the amber inclusions. A 98.79 ± 0.62 Ma (earliest Cenomanian) origin is now the most widely accepted age for the Hukawng Valley amber mine" (Shi et al. 2022)

• member-level stratigraphic resolution

Environment/lithology: terrestrial; amber

• "The ambers containing the fossils reported here were collected from a small pit mine and a larger strip mine exposing amber-associated facies about 1 m (75–125 cm) thick. The ambers are typically reddish brown in colour, with various shades of yellow, orange, and red. These colours range from pale to dark, and can vary from perfectly transparent to opaque. Organic matter particles is common in the amber." (Shi et al. 2022)

Size class: macrofossils

Preservation: amber

Collection methods: Repository: Qingdao University of Science and Technology, Shandong, China

Primary reference: C. Shi, S. Wang, H.-H. Cai, H.-R. Zhang, X.-X. Long, E. Tihelka, W.-C. Song, Q. Feng, R.-X. Jiang, C.-Y. Cai, N. Lombard, X. Li, J. Yuan, J.-P. Zhu, H.-Y. Yang, X.-F. Liu, Q.-P. Xiang, Z.-T. Zhao, C.-L. Long, H. Schneider, X.-C. Zhang, H. Peng, D.-Z. Li and Y. Fan. 2022. Fire-prone Rhamnaceae with South African affinities in Cretaceous Myanmar amber. Nature Plants 8:125-135 [B. Allen/B. Allen/B. Allen]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 227277: authorized by Bethany Allen, entered by Bethany Allen on 29.09.2022, edited by Morgan Ellingsworth

Creative Commons license: CC BY (attribution)

Taxonomic list

Polypodiopsida
 Cyatheales - Polypodiidae
Thyrsopteris cyathindusia n. sp.2
QUST-AM10321 (holotype)
Angiospermae
 Rosales - Rhamnaceae
Phylica piloburmensis n. sp.1 Shi et al. 2022 buckthorn
QUST-AM32127 (holotype), also QUST-AM33311, QUST-AM20513, QUST-AM20514
Eophylica priscastellata n. gen. n. sp.1 Shi et al. 2022 buckthorn
QUST-AM32413 (holotype), also QUST-AM20501–QUST-AM20510, QUST-AM20512, QUST-AM32415–QUST-AM32417, QUST-AM33310