Where: Nagasaki, Japan (32.8° N, 129.8° E: paleocoordinates 38.1° N, 124.4° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Okinoshima Formation (Iojima Group), Bartonian (41.3 - 38.0 Ma)

• According to foraminiferal and molluscan biostratigraphy, the formation is assigned in age to the Auverisian to the Bartonian (Upper Eocene). The Okinoshima Formation falls within calcareous nannofossil Subzones CP14a–CP15b of Okada and Bukry (1980) and planktic foraminiferal Zones E10–E13 of Berggren and Pearson (2005), dating to the middle Eocene. The Okinoshima Formation including calcareous nannofossils such as Reticulofenestra umbilica and Discoaster barbadiensis, indicating Zones CP14–CP15 and planktic foraminifer, Acarinina primitiva, representing Zone P14 or older (Yamaguchi et al. 2004). These biozones of planktic microfossils assign the Okinoshima Formation to 43.5–39.0 Ma (Yamaguchi & Kamiya, 2007).

• group of beds-level stratigraphic resolution

Environment/lithology: offshore; lithified, fine-grained, medium, concretionary, glauconitic, calcareous sandstone and lithified shale

Size classes: macrofossils, mesofossils

Collection methods: Repository: Dept. of Geology, Faculty of Education, Nagasaki Univ.

Primary reference: Y. Kamada. 1973. New Eocene marine mollusca from the Takshima coal-field, Nagasaki Prefecture, Kyushu. Science Reports of the Tohoku University, Series 2: (Hatai Memorial Vol) (6)235-240 [J. Sessa/L. Eccles/L. Eccles]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 103018: authorized by Jocelyn Sessa, entered by Laurie Eccles on 21.01.2011

Creative Commons license: CC BY (attribution)