Table T3. Cretaceous nannofossil zones, Ancora Site.

Zone/Subzone	Age (Gradstein et al., 1995)	Base definition	Top definition	Interval (ft [m])
CC26 Nephrolithus frequens1	latest Maastrichtian	LO Nephrolithus frequens	HO Nephrolithus frequens	618.1-631.1 (188.40-192.36)
CC26b5		LO Micula prinsii	HO Nephrolithus frequens
CC26a5		LO Nephrolithus frequens	LO Micula prinsii
CC25 Arkhangelskiella cymbiformis2	late Maastrichtian	HO Reinhardtites levis	LO Nephrolithus frequens	631.1-651.3 (192.36-198.52)
CC25c5		LO Micula murus	LO Nephrolithus frequens	631.1-indet. (192.36-indet.)
CC25b5		LO Lithraphidites quadratus	LO Micula murus	indet.-647.8 (indet.-197.45)
CC25a5		HO Reinhardtites levis	LO Lithraphidites quadratus	647.8-651.3 (197.45-198.52)
CC24 Reinhardtites levis3	late Maastrichtian	HO Tranolithus phacelosus	HO Reinhardtites levis	not present
CC23 Tranolithus phacelosus2	late Campanian to early Maastrichtian	HO Reinhardtites anthophorus	HO Tranolithus phacelosus	651.3-indet. (198.52-indet.)
CC22 Quadrum trifidum2	late Campanian	LO Quadrum trifidum	HO Reinhardtites anthophorus	indet.-709.5 ( indet.-216.26)
CC22a5		LO Quadrum trifidum	HO Lithastrinus grillii	678.8-709.5 (206.90-216.26)
CC21 Quadrum sissinghii3	middle to late Campanian	LO Quadrum sissinghii	LO Quadrum trifidum	709.5-753.5 (216.26-229.67)
CC20 Ceratolithoides aculeus3	middle Campanian	LO Ceratolithoides aculeus	LO Quadrum sissinghii	753.5-759.5 (229.67-231.50)
CC19 Calculites ovalis2	early to middle Campanian	HO Marthasterites furcatus	LO Ceratolithoides aculeus	759.5-903.0 (231.50-275.23)
CC18 Aspidolithus parcus2	early Campanian	LO Aspidolithus parcus	HO Marthasterites furcatus	903.0-918.5 (275.23-279.96)
CC17 Calculites obscurus2	latest Santonian	LO Calculites obscurus	LO Aspidolithus parcus	918.5-940.5 (279.96-286.66)
CC16 Lucianorhabdus cayeuxii2	middle to late Santonian	LO Lucianorhabdus cayeuxii	LO Calculites obscurus	not identified
CC15 Reinhardtites anthophorus2	early Santonian	LO Reinhardtites anthophorus	LO Lucianorhabdus cayeuxii	not identified
CC14 Micula staurophora2	late Coniacian	LO Micula staurophora	LO Reinhardtites anthophorus	not identified
CC13 Marthasterites furcatus2	latest Turonian to late Coniacian	LO Marthasterites furcatus	LO Micula staurophora	not identified
CC12 Lucianorhabdus maleformis2	middle to late Turonian	LO Lucianorhabdus maleformis	LO Marthasterites furcatus	not identified
CC11 Tetralithus pyramidus2	early to middle Turonian	LO Quadrum gartneri	LO Lucianorhabdus maleformis	not identified
Parhabdolithus asper4	late Cenomanian to early Turonian	HO Axopodorhabdus albianus	HO Parhabdolithus asper	1074.5-1076.4 (327.51-328.09)
Eiffellithus eximius Subzone4	early Turonian	HO Microstaurus chiastius	HO Parhabdolithus asper	not identified
Microstaurus chiastius Subzone4	late Cenomanian	HO Axopodorhabdus albianus	HO Microstaurus chiastius	1074.5-1076.4 (327.51-328.09)
Axopodorhabdus albianus4	late Cenomanian	LO Vagalapilla octoradiata	HO Axopodorhabdus albianus	1076.4-1146.7 (328.09-349.51)
CC10 Microrhabdulus decoratus2	early to late Cenomanian	LO Microrhabdulus decoratus	LO Quadrum gartneri	1074.5-1128.5 (327.51-343.97)
CC10b5		HO Microstaurus chiastius	LO Quadrum gartneri	1074.5-1101.7 (327.51-335.80)
CC10a5		LO Microrhabdulus decoratus	HO Microstaurus chiastius	1101.7-1128.5 (335.80-343.97)
CC9 Eiffellithus turriseiffelii2	late Albian to early Cenomanian	LO Eiffellithus turriseiffelii	LO Microrhabdulus decoratus	1128.5-1150.3 (343.97-350.61)

Notes: 1 = Cepek and Hay (1969), 2 = Sissingh (1977), 3 = Sissingh (1977) modified by Perch-Nielsen (1985), 4 = Bralower (1988), 5 = Perch-Nielsen (1985); LO = lowest occurrence, HO = highest occurence; indet. = indeterminate.