Where: Myanmar (21.7° N, 94.1° E: paleocoordinates 4.0° N, 94.2° E)

• coordinate stated in text

• outcrop-level geographic resolution

When: Kabaw Formation, Late/Upper Campanian (83.5 - 70.6 Ma)

• One tuff sample (M-1) was collected just above the amber-bearing layers for LA-(MC)-ICP MS U–Pb dating. Ten analyses provide the youngest age at 72.1 ± 0.3 Ma in weighted mean value (MSWD = 0.6; uncertainties are given at the 2σ level). Some ammonites were also found preserved in nodules of brown sandstone underlying the amber layer. They belong to Sphenodiscus sp. Sphenodiscidae probably originated in the African epicontinental seas during Campanian, with the oldest Sphenodiscus associated with Libycoceras in the Middle East, Nigeria, and Peru, indicating a late Campanian appearance. The first appearance of Sphenodiscus sp. in central Myanmar suggests a late Campanian to Maastrichtian age, providing a lower constraint for Tilin amber. Together with the radioisotopic age of 72.1 ± 0.3 Ma for the upper constraint, Tilin amber should be within the latest Campanian age.

• group of beds-level stratigraphic resolution

Environment/lithology: terrestrial; amber

Size class: macrofossils

Reposited in the NIGPAS

Primary reference: D. R. Zheng, S. C. Chang, V. Perrichot, S. Dutta, A. Rudra, L. Mu, R. S. Kelly, S. Li, Q. Zhang, J. Wong, J. Wang, H. Wang, Y. Fang, H. C. Zhang, and B. Wang. 2018. A Late Cretaceous amber biota from central Myanmar. Nature Communications 9(3170):1-6 [M. Clapham/M. Clapham/M. Clapham]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 195455: authorized by Matthew Clapham, entered by Matthew Clapham on 09.08.2018

Creative Commons license: CC BY (attribution)