IN THE ANGLO-PARIS BASIN 



75 



fragment of Hoplites (Isohoplites) sp. (GSM. Ca 1416) was obtained by Dr. R. Casey 

 from 1 foot 6 inches (0-457 m -) above the basal conglomerate indicating the eodentatus 

 Subzone. From 2-4 feet (0-60-1-21 m.) above the conglomerate there occur glau- 

 conitic gritty darkish grey clays with fossils in which the shells have been replaced 

 by pyrite. Ammonites from this bed collected by Dr. Casey include Lyelliceras cf. 

 lyelli (GSM. Ca 1423-4) and Hoplites (H.) spp. including H. (H.) baylei (GSM. Ca 

 1426), and Beudanticeras cf. albense (GSM. Ca 1431). A specimen of Protanisoceras 

 (P.) cf. barrense (GSM. Ca 1437) preserved in the same manner was picked up from 

 the tip. This assemblage indicates the lyelli Subzone. One specimen (GSM. Zn 

 2472) is a Hoplites (H.) sp. preserved partly phosphatised in mid-grey shelly clay and 

 is stated to have come from a height of about 12 feet (3-65 m.) above the basal con- 

 glomerate ; it indicates the spathi Subzone. 



suit \_irj •»„ _i_i 



Low«r Gracnsand 



Fig. 31. Locality map of borings yielding subzonal information in the Kent coalfield. 



Ebbsfleet 



Fragments of the core preserved in the Institute of Geological Sciences from this 

 boring, situated 495 yds S. 5°E. of Ebbsfleet House, Eastry (TR 337619), about 7$ 

 miles E. of the Chislet Colliery, shows that the Lower Gault was entered at between 

 depths of 977 and 978 feet (297-79-298-1 m.) and is about 27 feet thick (8-23 m.) 

 (Lamplugh, Kitchin & Pringle 1923 ; 178). Loricatus Zone sediments are definitely 

 present at 12 feet 6 inches (3-81 m.) above the base of the Gault (GSM., PI. 3854), and 



