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Age (Ma)<br />
89.3<br />
93.5<br />
CEN. TURONIAN CONIACIAN Stages<br />
UK<br />
Biozones<br />
Micraster<br />
coranguinum<br />
Micraster<br />
cortestudinarium<br />
Plesiocorys<br />
(Sternotaxis)<br />
plana<br />
Terebratulina<br />
lata<br />
Mytiloides spp.<br />
Middle Chalk Upper Chalk Traditional<br />
Subdivisions<br />
Neocardioceras juddii<br />
Metoicoceras geslinianum<br />
L.<br />
Calycoceras guerangeri Chalk<br />
Strongly<br />
cemented<br />
chalk<br />
East Anglia<br />
marker-beds<br />
(Bristow, 1990)<br />
Chalk<br />
Rock<br />
Twin<br />
Marls<br />
Shoreham<br />
Marl 2<br />
Grimes<br />
Graves<br />
Marl<br />
Top Rock<br />
(horizon<br />
variable;<br />
absent in<br />
places<br />
West Tofts<br />
Marl<br />
Mount<br />
Ephraim Marl<br />
Pilgrims' Walk<br />
Marl<br />
(un-named marl)<br />
Denton<br />
Lodge<br />
Marl<br />
Methwold<br />
Marl<br />
Melbourn<br />
Rock<br />
Plenus<br />
Marls Member<br />
Southern Province<br />
Chalk lithostratigraphy<br />
recognised in Berkshire<br />
- Chilterns area<br />
Top<br />
Rock<br />
Chalk Rock<br />
of<br />
Berkshire -<br />
Chilterns<br />
area<br />
Seaford<br />
Chalk<br />
Formation<br />
Lewes<br />
Nodular<br />
Chalk<br />
Formation<br />
(Caburn Marl)<br />
(Southerham<br />
Marl 1)<br />
(Glynde Marl)<br />
(New Pit<br />
Marls)<br />
New Pit<br />
Chalk<br />
Formation<br />
Holywell Nodular<br />
Chalk Formation<br />
White Chalk Subgroup<br />
Grey Chalk Subgroup<br />
Late<br />
Cretaceous<br />
tectonic<br />
events<br />
Ilsede<br />
Event<br />
Un-named<br />
event<br />
Slumping &<br />
faulting in<br />
German<br />
succession
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