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.