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Geological Guide to St Audries Bay, Somerset


(View of St. Audries Bay) - 2002

St Audries bay is most interesting for the geology of Somerset. To the East the bay exposes nearly the whole sequence of rocks from the Upper Triassic Mercia Mudstones and to the West of the bay, the beds succeed down to the Lower Jurassic Blue Lias beds. The Aldergrove beds (alternating gray mudstones and limestones) are well exposed. The Lower parts of the Blue Lias beds can be seen higher up walking further West.


(The Lower Lias, Shale and Limestone layers can clearly be seen) - 2002


(The Triassic Beds) - 2002


(Lower Lias Exposed on Foreshore) - 2003 [Sent in by Terri]

Jurassic
Late
Volgian Portlandian   142 to 147
Tithonian
147 to 150
Kimmeridgian
Late 150 to 154
Early
Oxfordian
Corallian 154 to 159.4
Late Oxford Clay
Middle
Callovian Middle Oxford Clay 159 to 165
Early Oxford Clay
Kellaways
Late Cornbrash
Bathonian Early Cornbrash 165 to 170
Forest Marble
Frome Formation
Wattonensis Beds
Fullers Earth
Zigzag Beds
Bajocian Late Inferior Oolite 170 to 177
Middle Inferior Oolite
Aalenian Early Inferior Oolite 177 to 180.1
Scissum Beds
Bridport Sands
Early
Toarcian (Late Lias) 180 to 190
Pliensbachian (Middle and Early Lias) 190 to 195
Sinemurian (Early Lias) 195 to 201
Hettangian (Early Lias) 201 to 205.7
Triassic
Late
Rhaetian Penarth group 206 to 210
Mercia Mudstone group
Norian 210 to 220
Carnian 220 to 227.4
Middle
Ladinian 227 to 233
Anisian 233 to 241.7
Early
Scythian
Olenekian 242 to 244
Induan 244 to 248.2

Hettangian
201 to 205.7 MYA
FORMATIONS AND DEPOSITS
LOCATIONS
E
A R
L
Y

L
I
A
S
Early Blue Lias Blue Anchor
St Audries Bay
Lilstock
Hinkley Point
Quantoxhead
Chippel Bay
Doniford Bay
Watchet
Redcar Mudstone Formation Early Calcareous Shales  
Dunrobin Bay Formation Lady's Walk Shale Golspie
White Sandstone Golspie
Carbonaceous Siltstone Golspie

Mercia Mudstone Group (Norian, Carnian, Ladinian)
210 - 233 MYA
FORMATIONS AND DEPOSITS
LOCATIONS
M
E
R
C
I
A

M
U
D
S
T
O
N
E

G
R
O
U
P

Red (Keuper) Marls Aust
Watchet
St Audries Bay
Doniford Bay
Blue Anchor
Tea Green Marls Aust
Lilstock
Blue Anchor
Blue Anchor Formation
Sully Beds




Images - (C)opyright 1998-2006 Alister Cruickshanks & Terri Crisp
Graphics & Content - (C)opyright 1998-2006 Alister Cruickshanks
UK Fossils Management - Alister Cruickshanks & Roy Bullard
UK Fossils Curator - Ian Cruickshanks
UK Fossils is a division of CWA Design and run in conjunction with UKGE. Whilst we try to ensure that all content is accurate and up to date we cannot guarantee this. UK Fossils takes no responsibility in the accuracy of this content, nor takes any liabilities for any trips, events or exchanges between visitors using either the discussion board or the UK Fossils planner. Any posted trips and events by UK Fossils are personal and not arranged by UK Fossils, therefore visitors should seek their own personal insurance cover. Please remember to always check the tide times.