Category:Standard zonation
STAGE | ZONE | SUBZONE |
MAASTRICHTIAN | ||
CAMPANIAN | 00 | |
G. quadrata | ||
O. pilula | Abundant O. pilula ? ? | |
E. depressula | ||
U. anglicus | ||
SANTONIAN | M. testudinarius | |
U. socialis | ||
M. coranguinum | ||
CONIACIAN | ||
M. cortestudinarium | ||
TURONIAN | S. plana | |
T. lata | ||
Mytiloides spp. | ||
CENOMANIAN | N. juddii | |
M. geslinianum | ||
C. guerangeri | ||
A. jukesbrownei | ||
A. rhotomagense | T. acutus | |
T. costatus | ||
C. inerme | ||
M. dixoni | ||
M. mantelli | M. saxbii | |
S. schluteri | ||
N. carcitanense |
Overview
Macrofossils are rather rare in the Chalk, and with the exception of the lower beds, ammonites, used as the basis of standard zonations elsewhere in the Mesozoic, are particularly uncommon and poorly preserved. For this reason, the standard biozonation of the Chalk is based on a mixture of ammonites, brachiopods, bivalves, crinoids and echinoids (see: standard macrofossil zonation & correlation of the UK Chalk Group), but correlation between this and the international ammonite zonation is not totally clear. More recently, inoceramid bivalves have been shown to have great utility in Chalk biostratigraphy (Jarvis and Woodroof, 1984; Gale, 1995, 1996). Microfossil biozonations for the Chalk (Carter and Hart, 1977; Hart et al., 1989; Swiecicki, 1980) can be indirectly related to the macrofaunal zones, and are valuable where other faunal data is absent or ambiguous.
Characteristic features of standard macrofossil zones/subzones and bio-marker horizons in the Chalk Group
The key features of the standard macrofossil zones and subzones are systematically described from oldest (Cenomanian) to youngest (Maastrichtian). Alternatively, to find out information about a specific zone or subzone, select it from the correlation table (see: standard macrofossil zonation and correlation of the UK Chalk Group). In the descriptions of zones and subzones that follow, 'northern England' means Lincolnshire and Yorkshire and 'southern England' is the remainder of the UK except East Anglia and Northern Ireland.
Pages in category "Standard zonation"
The following 37 pages are in this category, out of 37 total.
- Mantelliceras mantelli Zone
- Neostlingoceras carcitanense Subzone
- Sharpeiceras schlueteri Subzone
- Mantelliceras saxbii Subzone
- Mantelliceras dixoni Zone
- Cunningtoniceras inerme Zone
- Acanthoceras rhotomagense Zone
- Turrilites costatus Subzone
- Turrilites acutus Subzone
- Acanthoceras jukesbrownei Zone
- Calycoceras guerangeri Zone
- Metoicoceras geslinianum Zone
- Neocardioceras juddii Zone
- Mytiloides spp. Zone
- Terebratulina lata Zone
- Sternotaxis plana Zone
- Micraster cortestudinarium Zone
- Micraster coranguinum Zone/Hagenowia rostrata Zone
- Uintacrinus socialis Zone
- Marsupites testudinarius Zone
- Uintacrinus anglicus Zone
- Offaster pilula Zone
- Echinocorys depressula Subzone
- Subzone of abundant Offaster pilula
- Gonioteuthis quadrata Zone
- Hagenowia (blackmorei) Horizon (Subzone)
- Applinocrinus cretaceus Subzone
- Post Applinocrinus beds
- Belemnitella mucronata Zone s.l.
- Belemnella lanceolata Zone s.l.
- Belemnella occidentalis Zone
- Holaster subglobosus Zone
- Holaster trecensis Zone
- Sciponoceras gracile Zone
- Sphenoceramus (Inoceramus) lingua Zone
- Discoscaphites binodosus Subzone
- Gonioteuthis Zone