Difference between revisions of "Category:Foraminiferal zonation"

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| rowspan="2" align="center" |  '''26'''
 
| rowspan="2" align="center" |  '''26'''
 
|-valign="top"
 
|-valign="top"
| rowspan="2" | ''B. occidentalis''
+
| rowspan="2" | [[Belemnella occidentalis Zone | ''B. occidentalis'']]
 
|-valign="top"
 
|-valign="top"
 
| align="center" | '''25'''
 
| align="center" | '''25'''
 
|-valign="top"
 
|-valign="top"
| ''B. lanceolata ''s.l.
+
| [[Belemnella lanceolata Zone s.l. | ''B. lanceolata ''s.l.]]
 
| align="center" | '''24'''
 
| align="center" | '''24'''
 
|-valign="top"
 
|-valign="top"
 
| rowspan="9" | CAMPANIAN
 
| rowspan="9" | CAMPANIAN
| rowspan="3" | ''B. mucronata ''s.l.
+
| rowspan="3" | [[Belemnitella mucronata Zone s.l. | ''B. mucronata ''s.l.]]
 
| align="center" | '''23'''
 
| align="center" | '''23'''
 
|-valign="top"
 
|-valign="top"
Line 43: Line 43:
 
| align="center" | '''21'''
 
| align="center" | '''21'''
 
|-valign="top"
 
|-valign="top"
| rowspan="3" | ''G. quadrata''
+
| rowspan="3" | [[Gonioteuthis quadrata Zone | ''G. quadrata'']]
| rowspan="5" | ''I. lingua''
+
| rowspan="5" | [[Sphenoceramus (Inoceramus) lingua  | ''I. lingua'']]
| rowspan="5" | ''Gonioteuthis'' Zone
+
| rowspan="5" | [[Gonioteuthis Zone | ''Gonioteuthis'' Zone]]
| Post ''A. cretaceus''
+
| [[Post Applinocrinus beds | Post ''A. cretaceus'']]
 
| rowspan="3" align="center" |  '''20'''
 
| rowspan="3" align="center" |  '''20'''
 
|-valign="top"
 
|-valign="top"
| ''A. cretaceus''
+
| [[Applinocrinus cretaceus Subzone | ''A. cretaceus'']]
 
|-valign="top"
 
|-valign="top"
| ''Hagenowia '' horizon
+
| [[Hagenowia (blackmorei) Horizon | ''Hagenowia '' horizon]]
 
|-valign="top"
 
|-valign="top"
| rowspan="2" | ''O. pilula''
+
| rowspan="2" | [[Offaster pilula Zone | ''O. pilula'']]
| Abundant ''O. pilula ? ?''
+
| [[Subzone of abundant Offaster pilula | Abundant ''O. pilula ? ?'']]
| ''?D. binodosus''
+
| [[Discoscaphites binodosus Subzone | ''?D. binodosus'']]
 
| rowspan="2" align="center" |  '''19'''
 
| rowspan="2" align="center" |  '''19'''
 
|-valign="top"
 
|-valign="top"
| ''E. depressula''
+
| [[Echinocorys depressula Subzone | ''E. depressula'']]
 
| rowspan="29" |
 
| rowspan="29" |
 
|-valign="top"
 
|-valign="top"
| ''U. anglicus''
+
| [[Uintacrinus anglicus Zone | ''U. anglicus'']]
 
| rowspan="3" |
 
| rowspan="3" |
 
| rowspan="28" |
 
| rowspan="28" |
Line 68: Line 68:
 
|-valign="top"
 
|-valign="top"
 
| rowspan="4" | SANTONIAN
 
| rowspan="4" | SANTONIAN
| ''M. testudinarius''
+
| [[Marsupites testudinarius Zone | ''M. testudinarius'']]
 
|-valign="top"
 
|-valign="top"
| ''U. socialis''
+
| [[Uintacrinus socialis Zone | ''U. socialis'']]
 
|-valign="top"
 
|-valign="top"
| rowspan="5" | ''M. coranguinum''
+
| rowspan="5" | [[Micraster coranguinum Zone/Hagenowia rostrata Zone | ''M. coranguinum'']]
| rowspan="2" | Upper ''H.'' ''rostrata''
+
| rowspan="2" | Upper [[Micraster coranguinum Zone/Hagenowia rostrata Zone | ''H. rostrata'']]
 
| align="center" | '''17'''
 
| align="center" | '''17'''
 
|-valign="top"
 
|-valign="top"
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|-valign="top"
 
|-valign="top"
 
| rowspan="4" | CONIACIAN
 
| rowspan="4" | CONIACIAN
| rowspan="3" | Lower ''H. rostrata''
+
| rowspan="3" | Lower [[Micraster coranguinum Zone/Hagenowia rostrata Zone | ''H. rostrata'']]
 
|-valign="top"
 
|-valign="top"
 
| align="center" | '''15'''
 
| align="center" | '''15'''
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| align="center" | '''14'''
 
| align="center" | '''14'''
 
|-valign="top"
 
|-valign="top"
| ''M. cortestudinarium''
+
| [[Micraster cortestudinarium Zone | ''M. cortestudinarium'']]
 
| rowspan="6" |
 
| rowspan="6" |
 
| align="center" | '''13'''
 
| align="center" | '''13'''
 
|-valign="top"
 
|-valign="top"
 
| rowspan="5" | TURONIAN
 
| rowspan="5" | TURONIAN
| ''S. plana''
+
| [[Sternotaxis plana Zone | ''S. plana'']]
 
| align="center" | '''12'''
 
| align="center" | '''12'''
 
|-valign="top"
 
|-valign="top"
| rowspan="2" | ''T. lata''
+
| rowspan="2" | [[Terebratulina lata Zone | ''T. lata'']]
 
| align="center" | '''11'''
 
| align="center" | '''11'''
 
|-valign="top"
 
|-valign="top"
 
| rowspan="2" align="center" |  '''10'''
 
| rowspan="2" align="center" |  '''10'''
 
|-valign="top"
 
|-valign="top"
| rowspan="2" | ''Mytiloides ''spp.
+
| rowspan="2" | [[Mytiloides spp. Zone | ''Mytiloides ''spp.]]
 
|-valign="top"
 
|-valign="top"
 
| align="center" | '''9'''
 
| align="center" | '''9'''
 
|-valign="top"
 
|-valign="top"
 
| rowspan="14" | CENOMANIAN
 
| rowspan="14" | CENOMANIAN
| ''N. juddii''
+
| [[Neocardioceras juddii Zone | ''N. juddii'']]
| rowspan="3" | ''S. gracile''
+
| rowspan="3" | [[Sciponoceras gracile Zone | ''S. gracile'']]
 
| rowspan="2" align="center" |  '''8'''
 
| rowspan="2" align="center" |  '''8'''
 
|-valign="top"
 
|-valign="top"
| rowspan="2" | ''M. geslinianum''
+
| rowspan="2" | [[Metoicoceras geslinianum Zone | ''M. geslinianum'']]
 
|-valign="top"
 
|-valign="top"
 
| align="center" | '''7'''
 
| align="center" | '''7'''
 
|-valign="top"
 
|-valign="top"
| ''C. guerangeri''
+
| [[Calycoceras guerangeri Zone | ''C. guerangeri'']]
| ''H. trecensis''
+
| [[Holaster trecensis Zone | ''H. trecensis'']]
 
| align="center" | '''6'''
 
| align="center" | '''6'''
 
|-valign="top"
 
|-valign="top"
| rowspan="2" | ''A. jukesbrownei''
+
| rowspan="2" | [[Acanthoceras jukesbrownei Zone | ''A. jukesbrownei'']]
| rowspan="10" | ''H. subglobosus''
+
| rowspan="10" | [[Holaster subglobosus Zone | ''H. subglobosus'']]
 
| align="center" | '''5'''
 
| align="center" | '''5'''
 
|-valign="top"
 
|-valign="top"
 
| rowspan="4" align="center" |  '''4'''
 
| rowspan="4" align="center" |  '''4'''
 
|-valign="top"
 
|-valign="top"
| rowspan="2" | ''A. rhotomagense''
+
| rowspan="2" | [[Acanthoceras rhotomagense Zone | ''A. rhotomagense'']]
| ''T. acutus''
+
| [[Turrilites acutus Subzone | ''T. acutus'']]
 
|-valign="top"
 
|-valign="top"
| ''T. costatus''
+
| [[Turrilites costatus Subzone | ''T. costatus'']]
 
|-valign="top"
 
|-valign="top"
| ''C. inerme''
+
| [[Cunningtoniceras inerme Zone | ''C. inerme'']]
 
| rowspan="3" |
 
| rowspan="3" |
 
|-valign="top"
 
|-valign="top"
| rowspan="2" | ''M. dixoni''
+
| rowspan="2" | [[Mantelliceras dixoni Zone | ''M. dixoni'']]
 
| align="center" | '''3'''
 
| align="center" | '''3'''
 
|-valign="top"
 
|-valign="top"
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|-valign="top"
 
|-valign="top"
 
| rowspan="3" | ''M. mantelli''
 
| rowspan="3" | ''M. mantelli''
| ''M. saxbii''
+
| [[Mantelliceras saxbii Subzone | ''M. saxbii'']]
 
| rowspan="3" align="center" |  '''1'''
 
| rowspan="3" align="center" |  '''1'''
 
|-valign="top"
 
|-valign="top"
| ''S. schluteri''
+
| [[Sharpeiceras schlueteri Subzone | ''S. schluteri'']]
 
|-valign="top"
 
|-valign="top"
| ''N. carcitanense''
+
| [[Neostlingoceras carcitanense Subzone | ''N. carcitanense'']]
 
|}
 
|}
 
</div style="font-size: 80%">
 
</div style="font-size: 80%">

Revision as of 13:44, 1 October 2013

STAGE STANDARD ZONE STANDARD SUBZONE BGS foraminiferal biozone
Northern England East Anglia Northern England
DANIAN
MAASTRICHTIAN B. casimirovensis 27
B. junior 26
B. occidentalis
25
B. lanceolata s.l. 24
CAMPANIAN B. mucronata s.l. 23
22
21
G. quadrata I. lingua Gonioteuthis Zone Post A. cretaceus 20
A. cretaceus
Hagenowia horizon
O. pilula Abundant O. pilula ? ? ?D. binodosus 19
E. depressula
U. anglicus 18
SANTONIAN M. testudinarius
U. socialis
M. coranguinum Upper H. rostrata 17
16
CONIACIAN Lower H. rostrata
15
14
M. cortestudinarium 13
TURONIAN S. plana 12
T. lata 11
10
Mytiloides spp.
9
CENOMANIAN N. juddii S. gracile 8
M. geslinianum
7
C. guerangeri H. trecensis 6
A. jukesbrownei H. subglobosus 5
4
A. rhotomagense T. acutus
T. costatus
C. inerme
M. dixoni 3
2
M. mantelli M. saxbii 1
S. schluteri
N. carcitanense

Overview

Foraminifera from the Chalk Group have been taxonomically described for many years and since the 1970’s biostratigraphical applications have also been discussed. It is becoming more evident that foraminiferal inceptions and extinctions can be tied in with lithostratigraphical markers (eg. marl seams, flint bands) and macrofaunal events (eg. sponge beds, Inoceramus-rich beds), to provide a very detailed subdivision of the Chalk Group. Unfortunately, earlier biostratigraphical accounts often failed to record detailed stratigraphical and lithological information relating to sample positions within the succession, thus limiting their usefulness.

The unpublished scheme used herein for the Chalk Group of the UK recognises a maximum of 27 foraminiferal zones, and has been compiled from a variety of published and unpublished sources (Bailey, 1978; Swiecicki, 1980; Bailey et al., 1983, 1984; Hart et al., 1989; Carter & Hart, 1977, Hart, 1982; Jarvis et al., 1988; Mortimore, 1986). Data for offshore areas (King et al., 1989) mostly relates to uncored hydrocarbon wells, and the biostratigraphical scheme for these is based on the extinction horizon (‘Last Appearance Datum’ or ‘First Downhole Occurrence’) of key taxa.; caving in these boreholes makes the first appearance uphole, or inception, an unreliable datum.

The zones, numbered 1 to 27 from oldest to youngest, are pre-fixed 'BGS' to differentiate them from previously published schemes, and where possible, they are related to the UKB zones of Hart et al. (1989), macrofaunal zones and lithostratigraphical marker horizons.

Descriptions of foraminiferal biozones in the Chalk Group

In the following account the BGS foraminiferal zones of the Chalk Group are systematically described from oldest (BGS 1) to youngest (BGS 27). Alternatively, for information about a particular zone, select it from the summary table (summary correlation of foraminiferal and macrofaunal zones)

Subcategories

This category has only the following subcategory.
The number of included categories (C), pages (P) and files (F) is stated in brackets.