Also known as Locality N-4

Where: Shandong, China (36.6° N, 118.7° E: paleocoordinates 36.5° N, 116.3° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Shanwang Formation, Burdigalian (20.4 - 16.0 Ma)

• From He et al. 2011: "40Ar/39Ar ages obtained from basalts of the Niushan and Yaoshan Formations, which underlie and overlie the Shanwang Formation, are 21.0 ± 2.5 Ma (2σ, full external error) and 17.3 ± 1.5 Ma (2σ, full external error), respectively. The 40Ar/39Ar age of the basalt in the Shanwang Formation is 17–18 Ma. Given the age constraints of the basalts of the Yaoshan and Shanwang Formations, the age of the Shanwang biota is estimated to be ca. 17 Ma, late Burdigalian of the Early Miocene,". Yu et al. 2021 support this, stating "Paleomagnetic and radio isotope dating data shows that the diatomaceous shale was deposited during Chron C5En, which places it at approximately 18.5 Ma during the Burdigalian stage of the Early Miocene, rather than in the Middle Miocene as previously thought."

• group of beds-level stratigraphic resolution

Environment/lithology: marine; diatomite

Size class: macrofossils

Preservation: mold/impression, adpression

Reposited in the NIGPAS

Primary reference: Y.-S. Liu, S.-X. Guo, and D. K. Ferguson. 1996. A catalogue of Cenozoic megafossil plants in China. Palaeontographica Abteilung B 238:141-179 [B. Allen/B. Allen]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 223803: authorized by Bethany Allen, entered by Bethany Allen on 01.12.2021

Creative Commons license: CC BY (attribution)