Where: Micronesia, Federated States of (9.6° N, 138.2° E: paleocoordinates 9.6° N, 138.2° E)

• coordinate estimated from map

• small collection-level geographic resolution

When: CN 4 nannofossil zone, Map Formation, Langhian (16.0 - 13.8 Ma)

• In addition to the abundant Cyclicargolithus floridanus, Sphenolithus heteromorphus is also abundant or common in these samples. Because of the presence of the latter species, the nannoflora observed in these samples are identifiable to that of the late Early Miocene Zone CN 3 or early Middle Miocene Zone CN 4 (Okada and Bukry, 1980). According to Berggren et al. (1995), these two zones range from 18.2 to 13.6 Ma in age. The first occurrence of Reticulofenestra pseudoumbilicus generally occurs within Zone CN 4. Sample 14-d in which rare specimens identifiable to this species occurred is possibly assignable to the lower Middle Miocene sediment.

• bed-level stratigraphic resolution

Environment/lithology: basinal (); lithified lime mudstone

Size class: microfossils

Collection methods: peel or thin section

Primary reference: K. Fujioka, H. Matsuoka, G. Kimura, A. Takeuchi, H. Matsugi and H. Okada. 1998. Age constraint on the obduction of ophiolitic rocks in the Yap Island, Philippine Sea, using nannofossils. Journal of the Geological Society of Japan 104:415-418 [M. Clapham/M. Clapham]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 191884: authorized by Matthew Clapham, entered by Matthew Clapham on 19.02.2018

Creative Commons license: CC BY (attribution)