The geology of East Yorkshire.

Lithostratigraphy and chronostratigraphy.

lithostratigraphy

thickness

Geological

period

Geological

Stage

Approximate Date

Silts and alluvium

 

Quaternary

Holocene

0-10 000 yrs BP

Mere deposits

Up to 4m

Quaternary

 

0-10 000

Withernsea Till

0-24m

Quaternary

Devensian

Ca 16 000

Skipsea Till

5-9m

Quaternary

Devensian

Ca 16 000

Dimlington Moss Bed

Ca 1m

Quaternary

Devensian

Ca 18 500

Raised Beach Sewerby

1m

Quaternary

Ispwichian

Ca 120 000

Basement Till

Up to 40m

Quaternary

Wolstonian

 

Speeton Shell Bed

3m

Quaternary

Ilfordian

Ca 186 to 245 ka

Remnants of older Tills

?

Quaternary

 

 

Chalk Rafts - Rowe Fm

?

U Cretaceous

U Cam - L Maa

70-76 ma

Flamborough Fm

>230m

U Cretaceous

L Campanian

76-80

Burnham Fm

Ca 80m

U Cretaceous

Con - San

80-90

Welton Fm

86m

U Cretaceous

Turonian

90-82

Black Band Mbr

< 2m

U Cretaceous

Cen - Tur

92

Ferriby Fm

23m

U Cretaceous

Cenomanian

92-100

Red Chalk Fm

1 - 30m

L Cretaceous

Albian

100-104

(A Beds Speeton Clay in north)

8m

L Cretaceous

L Albian

104-108

Carstone Fm (in south)

0-2m

L Cretaceous

U Aptian

108-110

(B Beds Speeton Clay in north)

Ca 40m

L Cretaceous

Barremian & Apt

108-125

(C Beds Speeton Clay in north)

39m

L Cretaceous

Hauterivian

125-130

(D Beds Speeton Clay in north)

14m

L Cretaceous

Ber, Val & L Haut

128-140

(E Bed Speeton Clay in north)

10cm

L Cretaceous

 

 

unconformity

 

 

 

 

Ancholme Clays

0-300m

U Jurassic

Oxf-M Kim

150-160

Brantingham Fm

Up to 15m

U Jurassic

Oxf

155-160

Kellaways Rock Mbr

Up to 2m

U Jurassic

Cal

160-165

Kellaways Sands Mbr

0 - 10m

U Jurassic

Cal

160-165

Kellaways Clay Mbr

0-2m

U Jurassic

Cal

160-165

Cornbrash Fm

Ca 1m

M-U Jurassic

U Bat - Cal

160-166

Glentham Fm

Ca 10m

M Jurassic

Bat

166-170

Cave Oolite Mbr

Ca 10m

M Jurassic

Baj

170-175

Raventhorpe Beds Mbr

0-5m

M Jurassic

Baj

170-175

(unconformity)

 

 

 

 

Coleby Mudstone Fm

(Middle Lias)

30-100m

L Jurassic

U Sin - L Toar

186-193

Scunthorpe Mudstone Fm

(Lower Lias)

45-90m

L Jurassic

Het - L Sin

193-200

Cotham Mbr

4-8m

U Triassic

Rhaetian

210 to 200

Westbury Fm

3-12m

U Triassic

Rhaetian

210 to 200

Mercia Mudstone Fm

Ca 250m

M Triassic

 

245 to 230

Sherwood Sandstone Fm

300 - 465m

L Triassic

 

250 to 245

(Magnesian Limestone)

 

U Permian

 

265 to 250

 

 

Notes -

Thicknesses - Chalk from Horne unpub 1988, Speeton Clay from Catt & Neale 1994, Jurassic and below from Gaunt et al. 1992 and own observations.

Dates are very approximate and are taken from Lemon 1990.

 

Rock in Blue can be seen at coastal exposures. Rocks in Dark Red can sometimes be seen in coastal exposures. Rocks in Red can be seen in private quarries. Rocks in green are sometimes seen in temporary exposures.