MIDDLE ALBIAN (LOWER GAULT) |
Stratigraphy
at Folkestone |
based on a section at Copt Point |
Ammonite Zone | Ammonite Sub-zone | Bed | Lithology | Meters |
LATE ALBIANMortoniceras
inflatum (part) | Dipoloceras cristatum (part) | VIII | | |
MIDDLE ALBIAN | VII | mid-grey clay with shell seams containing pyritised
fossils and scattered phosphatised fossils | 0.84 | |
1.54 | ||||
VI | Lenticles of light grey clay, extensively burrowed
with dark grey clay infillings in mid-grey clay | 0.305 | ||
V | Shelly burrowed mid-grey clay with scattered brown
phosphates | 0.46 to 0.48 | ||
MIDDLE ALBIAN | Euhoplites meandrinus | IV | (iii) Abraded black phosphatised nodules and fossils
in grey clay | 0.025 to 0.05 |
Dipoloceroides subdelaruei | (ii) Dark grey shelly clay | 0.1 | ||
(i) Seam of bivalves, part phosphatised fossils &
buff phosphatised nodules | 0.025 | |||
Dimorphoplites niobe | III | Fawn grey clays with shell seams and partly phosphatised
fossils and occasional lenticles of ferruginous marlstone | 1.83 | |
Anahoplites intermedius | II | (iv) Dark grey clay black when wet, with seams of
crushed & pyritic shells passing at top by lenses of fawn clay into bed III | 0.89 | |
(iii) Blackish phosphatic nodules in dark grey clay | 0.025 | |||
(ii) Dark grey clay, black when wet, with seams of
crushed shells | 0.38 | |||
(i) Crushed and part phos. shelly and irregular phosphatic
nodules | 0.05 | |||
I | (vii) Dark-grey slightly silty shelly clay | 1.575 | ||
MIDDLE ALBIAN | Hoplites spathi | (v) Gritty grey clay becoming more glauconitic and
gritty downward; sparsely shelly with occasional seams of phosphatic "clots" | 1.22 | |
(v) Large phosphatic nodules mainly casts of ammonites
in shelly glauconitic loam "dentatus nodule bed" | 0.1 | |||
Lyelliceras lyelli | (iv) Highly glauconitic loam with few blackish phosphatic
nodules | 0.1 to 0.18 | ||
(iii) Scattered spherical septarian phosphatic nodules | 0.05 | |||
EARLY ALBIAN (Part) Douvilleiceras
mammillatum | *Pseudosonneratia (Isohoplites) steinmanni Otohoplites bulliensis Protohoplites
(Hemisonneratia) puzosianus Otohoplites raulinianus Cleoniceras floridum | | (ii) Highly glauconitic loam with scattered
lumps of blackish phosphate and a few spherical nodules at the base | 0.275 |
11.
"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. Abundant fossil wood. | 0.38 | |||
10.
Course grey sand, somewhat clayey at top | 0.45 to 0.61 | |||
9. Main mammillatum Bed. Seam of
coarse yellow-green sand and grit with clusters of phosphatic nodules | 0.15 to 0.30 | |||
9. Very coarse yellowish sand and grit | 0.30 to 0.46 |
References: |
a. Owen H.G. 1971. Middle Albian Stratigraphy in the Anglo-Paris Basin Bulletin of the British Museum (Natural History) Geology, Supplement 8 b. Casey R. 1961. The Stratigraphical Palaeontology of the Lower Greensand; Paleontology, Vol 3, Part 4, pp. 487-621 |