EARLY ALBIAN (FOLKESTONE BEDS) | ||
Section of Folkestone Beds (Early Albian) at Bakers Gap, East Cliff, Folkestone
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The Folkestone Beds section at Baker's Gap, about 30 yds short of the eastern end of the promenade, was described in detail by Casey (1961, p. 528) as follows. It is now largely obscured, but in the cliffs between Bakers Gap and Copt Point, Casey's Bed 35 through 20 can still be readily seen. | ||
Stratigraphy at Folkestone |
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35 |
Sulphur Band. An indurated layer of phosphatic nodules, the nodules veined and encrusted with pyrites and embedded in a matrix of clayey greensand, the whole coloured yellow and reddish-brown by decomposition products. Two distinct concentrations of nodules recognisable. |
1ft to 1ft 3 |
34 |
Coarse grey sand, somewhat clayey at top |
1ft 6 to 2ft |
33 |
Main mammillatum Bed. Seam of coarse yellow-green sand and grit with clusters of phosphatic nodules |
6 to 1ft |
32 |
Very coarse yellowish sand and grit |
1ft to 1ft 6 |
31 |
Incoherent yellowish greensand |
3ft |
30 |
Hummocky band of indurated sand and grit with pockets of small pebbles weathered out as knobs on the upper surface |
1ft 3 |
29 |
Very coarse yellowish sand and grit with small pebbles and shell fragments |
2ft 2 |
28 |
Sonneratia kitchini Bed. Line of small black phosphatic nodules scattered irregularly through coartse yellowish sand. Wisps of grey clay. |
4 to 8 |
Leymeriella tardefurcata Zone |
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27 |
Very coarse sand and grit as 32 |
2ft 2 |
26 |
Hummocky band of indurated calcareous grit |
1ft 2 |
25 |
Yellowish greensand with small ferruginous nodules scattered and in lines |
10ft |
24 |
Band of carious spicular sandstone, porcellanous and cherty in places |
9 |
23 |
Yellow greensand with lenticles of sandstone as above. Comminuted lamellibranch shells |
1ft 2 |
22 |
Yellowish greensand |
3ft 9 |
21 |
Sandstone as 24 |
6 to 10 |
20 |
Yellowish greensand |
3ft 9 |
19 |
Impersistent sandstone as 24 |
0 to 5 |
18 |
Yellowish greensand |
2ft 5 |
17 |
Tough grey calcareous sandstone |
1ft 4 |
16 |
Yellowish greensand |
11 |
15 |
Impersistent sandstone as 24 |
0 to 3 |
14 |
Yellowish greensand |
3ft |
13 |
Hummocky tough grey calcareous sandstone |
9 to 1ft |
12 |
Sandstone as 24 |
9 to 1ft |
11 |
Yellowish-green, slightly clayey sand with patches and wisps of iron-staining |
4ft 4 |
10 |
Impersistent sandstone as 24 |
0 to 3 |
9 |
Sand as 11. Obscured by talus |
Est. 7ft |
8 |
Sandstone as 24 |
6 |
7 |
Greenish loamy sand, weathering brown |
1ft 3 |
6 |
Bright-green loamy sand |
1ft 4 |
5 |
Pockets of small phosphatic nodules and pebbles of black chert. Large Exogyra numerous |
0 to 2 |
4 |
Tough grey-green, glauconitic, calcareous sandstone band |
1ft 9 |
3 |
Nodular bed as 5 |
0 to 2 |
2 |
Well compacted clayey greensand with abundant shell fragments and very small pebbles of black chert |
2ft |
1 |
Firm glauconitic loamy sand, weathering brown, holding a great quantity of pebbles and black phosphatic nodules, with large spherical concretions of ferrugino-phosphatic rock at the base. Ecrusting oysters common. |
1ft |
Reference: | Casey R. 1961. The Stratigraphical Palaeontology of the Lower Greensand; Paleontology, Vol 3, Part 4, pp. 487-621 | |