SESSION 1906-1907. li 



Field Meeting, 6th April, 1907. 

 BUSHEY AND CROXLEY. 



This meeting was held in conjunction with the Geologists' 

 Association, Mr. Hopkinson and Mr. Henry Kidner acting as the 

 Directors for both Societies. Bushey Eailway Station was the 

 place of meeting. Here a cutting through the Reading Beds, 

 which are 35 feet in thickness, terminates. Proceeding along 

 the top of the cutting on its western side a "trial hole" was 

 seen. It has been made in order to ascertain the nature of the 

 strata to be encountered in constructing the proposed electric 

 line to Watford, and shows a fine light-coloured sand. 



Crossing the bridge over this cutting, Grover's brickfield in 

 Lower Paddock Road was visited. In it was seen a bed of 

 pebbles and sand of the Reading Series, partly converted into 

 a conglomerate, the exposure being, in fact, the best section of 

 the Hertfordshire conglomerate or " plum-pudding stone " now 

 to be seen in the county. It is about 3 feet thick, and lies upon 

 light-coloui'ed sand seen for a depth of nearly 4 feet. On 

 a level with these beds were seen the clays of the higher part of 

 the Reading Series and the basement-bed of the London Clay 

 with its thin band of flint-pebbles at the top. It appears to be 

 most probable that this indicates a north and sovith fault with 

 a downthrow of 7 or 8 feet on the east, the fault having its 

 origin in the chalk below. The brickfield has not been worked 

 for some time and is now being filled in with refuse, and on the 

 insanitary soil thus formed, houses will probably before long 

 be built. 



The Bushey Chalk Pit, near the Colne Valley Water Works, 

 was next visited. The section of Upper Chalk and overlying 

 beds exposed has been described in accounts of previous visits. 

 On this occasion several fossils were found in the Chalk, and 

 the view expressed by Mr. Jukes-Browne in the 3rd volume of 

 his 'Cretaceous Rocks of Britain' (Mem. Greol. Suiwey), that 

 this pit is more probably in the zone of Micraster corangnimtm 

 than in that of M. cortestudinarium, was confirmed. 



The following is a list of fossils found in the pit, mostly in 

 the lower part, including a few from the cutting towards the 

 Watford tunnel. It is compiled from one in the work referred 

 to above (pp. 233-234), a list sent to the writer by Mr. C. P. 

 Chatwin and Mr. T. H. Withers and published in the ' Pro- 

 ceedings of the Geologists' Association' (vol. xx, p. 95), and 

 other records there given for this pit. 



Forammifera. — Crystallaria rotulata, Lituola nautiloides, 

 Webbina sp. 



8'pongida. — Porosphsera globularis, Thamnospongia sp.. 

 Ventriculites impressus. 



Actinozoa. — Parasmilia sp. 



Echinodermata. — Bourgueticrinus ellipticus, Cidaris clavigera, 

 C.perornata, C. sceptifera, C. subvesiculosa, Echinocorys scutatus, 



