PLEISTOCENE DEPOSITS IN BILLERICAY, ESSEX 163
Xanthogramma pedissequum E. arbustorum L.
Harris E. nemorum. L.
Scaeva pyrastri L. Merodon equestris F.
Syrphus ribesii L. Myiatropa florea L.
S. vitripennis Mg. Helophilus pendulus L.
S. eligans Harris H. hybridus Loew
S. corollae F. Xylota segnis L.
S. luniger Mg. Syritta pipiens L.
Eumerus tuberculatus Rond.
Reference
Coe, R. L. (1953). Handbooks for the Identification of British Insects, 10, 2.
Diptera, Syrphidae.
Pleistocene Deposits at Billericay, Essex
By W. J. French
with an Appendix on Temporary Exposures at Rayleigh
By J. T. Greensmith
Contents
PAGE
1. INTRODUCTION ...................................... 163
2. THE PEBBLE GRAVEL ........................... 165
3. GLACIAL DEPOSITS ................................ 170
4. DISCUSSION ............................................ 171
REFERENCES ......................................... 172
APPENDIX ............................................. 172
Abstract
Recent temporary excavations at Billericay have provided several ex-
cellent sections through the Pleistocene and Eocene deposits of the district.
These include sections through previously unmapped glacial deposits and
through the local Pebble Gravel.
Introduction
Billericay stands at the southern limit of Pleistocene glaciation
and on the high ground immediately north of the enigmatic,
almost driftless Crouch valley. In the town itself the early
Pleistocene Pebble Gravel overlies Bagshot Sands and caps
relatively high ground. At slightly lower levels are representatives
of the older of two local glacial phases (known as the Hanningfield
Till, Clayton, 1957). These rest directly on London Clay. Recent
building in this evidently geologically important area has given
many excellent temporary sections through all the local deposits.