Broken specimen
In the mobile mount.
Heliolithus riedelii Bramlette and Sullivan, 1961
Bramlette, M. N. & Sullivan, F. R. 1961, Coccolithophorids and related nannoplankton of the Early Tertiary in California. Micropaleontology 7(2): 129-188.
Heliolithus riedelii
Bramlette & Sullivan, 1961
Late Paleocene
Lodo section, northwestern Fresno County, central California, USA