Sub-Stage

Ammonite Zone

Ammonite Subzone

Bed

Lithology

Metres

LATE ALBIAN

(UPPER GAULT)

Stoliczkaia dispar

Mortoniceras (Durnovarites) perinflatum

XIII

FAWNISH GREY MARLY CLAY

8.84

Mortoniceras (Mortoniceras) rostratum

MOTTLED LIGHT GREY AND FAWN GREY MARLY CLAY

0.91

BLUISH PALE GREY MARLY CLAY HIGHLY GLAUCONITIC AT BASE BUT GLAUCONITE GRAINS DIMINISH UPWARDS IN SIZE AND NUMBER

3.96

Callihoplites

auritus

XII

HIGHLY CLAUCONITIC LIGHT GREY WITH SCATTERED PHOSPHATIC NODULES AND A SEAM OF THEM AT BASE

0.99

XI

PALE GREY MARLY CLAY WITH PHOSPHATIC NODULE BED AT BASE

10.67

Hysteroceras varicosum

1.55

X

TOUGH LIGHT GREY MARLY CLAY WITH PHOSPHATIC NODULES AT TOP AND IN A SEA AT 0.73 M BELOW TOP

Hysteroceras orbignyi

IX

LIGHT GREY MARLY CLAY INDURATED AT TOP WHICH IS MARKED BY PHOSPHATIC NODULES.  MARLSTONE LENTICLES OCCUR BETWEEN 0.76M AND 1.7M ABOVE BASE.

2.85

Dipoloceras cristatum

VIII

(iii) PHOSPHATIC NODULES AND PART-PHOSPHATISED FOSSILS IN SHELLY GREY CLAY

0.075 to 0.1

(ii) MID-GREY CLAY WITH NUMEROUS Inoceramus (Birostrina) sulcata

0.225 to 0.28

(i) BLACK PHOSPHATIC NODULES IN SHELLY CLAY

0.05

Middle Albian (Lower Gault) (part)

Euhoplites

lautus (part)

Anahoplites

daviesi (part)