In the mobile mount.
Hornibrookina australis Edwards & Perch-Nielsen 1975
Hornibrookina arca Bybell & Self-Trail, 1995
Bybell, L. M. & Self-Trail, J. 1995. Evolutionary, biostratigraphic and taxonomic study of calcareous nanofossils from a continuous Palaeocene-Eocene boundary section in New Jersey. U.S. Geological Survey, Professional Paper. 1554: 1-36.
Edwards, A. R., Perch-Nielsen, K., 1975. Calcareous nannofossils from the southern Southwest Pacific, Deep Sea Drilling Project, Leg 29. Initial Reports of the Deep Sea Drilling Project 29, 469-539.
Hornibrookina australis
Edwards & Perch-Nielsen, 1979
Late Paleocene
DSDP Leg 29, Site 277, Campbell Plateau, Pacific