(Blue Anchor) - 1994
Blue Anchor is the age of the Upper and Lower Rhaetic from the Triassic. The succession at Blue Anchor is split into five main sections.
Watchet and Langport Beds: This is the first of the beds at Blue Anchor, these are White Lias, laminated shale's and limestone's. The bed is around 9ft thick
The Cotham Beds: These Greenish grey shale's and thin shelly limestone's with Cotham Marble. The bed at this level is 3ft thick. The beds then form a pale limestone with thin brown marl at the base lasting for 1 foot.
The Westbury Beds are the fossiliferous section, the beds begin with black shale's (limestone's in the first upper 6ft of this bed, fossils here include Rhaetavicula contorta, Chlamys valoniensis, Tutcheria cloacina and Eotrapezium concentricum. This bed is around 23ft thick. A Ceratodus Bone Bed follows with massive grit with fish remains resting on thin ripple-marked sandstone. This is the layer which is of most importance as far as collecting is concerned. Following is another layer, 21ft thick of black fossiliferous shale's and thin, commonly nodular limestone with occasional sandstone's in the lowest 4ft. Larger bones can be found in this layer but are less common. The Westbury Beds end with the Basal Bone bed.
The forth main section is the Sully Beds, of a Greyish green and yellow marls. This bed lasts 13 ft.
The last section makes the bulk of the cliff exposures, the Tea Green and Grey Marls, lasting around 110ft in thickness. One of the most noticing aspects of Blue Anchor are the alernating grey and green midstones with nodula white and pink gypsum (alabaster). This is the Blue Anchor Formation.
(The Triassic Red beds of Blue Anchor) - 2000
(Blue Anchor fault) - 2003 [Sent in by Terri]
|
|
Late |
Volgian |
Portlandian |
|
142 to 147 |
| Tithonian |
| 147 to 150 |
|
Late |
150 to 154 |
| Early |
|
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 |
| Dunrobin Bay Formation |
Lady's Walk Shale |
Golspie |
| White Sandstone |
Golspie |
| Carbonaceous Siltstone |
Golspie |
|
1:250 000 Geological Map of Blue Anchor
Geological Maps are sold either Flat or Folded for Solid, or Seabed geology. Special editions may be available for certain locations. For a complete list click the link below.
Click here to BUY ONLINE from our Store |
|
1: 50 000 Geological Map of Blue Anchor
Geological Maps are sold either Flat or Folded for Solid, Drift or combined geology. Special editions may be available for certain locations. For a complete list of
1: 50 000 maps, click the link below.
Click here to BUY ONLINE from our Store |
