274 NOTES ON ESSEX GEOLOGY.
find no examples in the collections referred to. Vitrea nitidula
was recorded for the first time, and fourteen other new records
were made from a collection which was examined after the paper
was read : a notable haul.
The first volume of A. J. Jukes-Browne's great monograph
on the Upper Cretaceous rocks,19 deals with the underground
Gault of Essex on pp. 370, 372, 373, from the results of four
deep borings. Of course we are bound to protest at Saffron
Walden being placed in Suffolk, and I am not disposed to agree
with the view that either from the total depth having been
overstated, or from boring having gone askew, the Gault was
not pierced there ; but of that I shall speak elsewhere.
1901.
The sixth and last edition of my little Guide to the Geology
of London,20 appeared in this year, and it has been long out
of print. The new map of the London District having been
issued, H. B. Woodward wrote in illustration of it "The Geology
of the London District" (1909), and this being fuller and newer
than the Guide, and at the same time no dearer, it has taken the
place of the earlier work.
1902.
F. W. Harmer's "Sketch of the Later Tertiary History of
East Anglia,"21 covers much the same ground as his paper
of 1900, so far as Essex Crag is concerned (pp. 430-442), and
Essex Drifts are not dealt with.
1903.
In the "Summary of Progress of the Geological Survey
for 1902," there is a short paragraph on Essex (p. 24), a note
on the Woodford and Ilford Railway (p. 194), and an essay
on the Drifts of the Thames Valley near London, by T. J. Pocock
(pp. 199-207), in which a section at Upminster is noticed, as
showing Boulder Clay beneath brickearth and said to be under-
lain by sand. This is no great way from the sections described
by Holmes (1892, 1894). The author regards the brickearth
19 Geol. Survey Memoir,"The Cretaceous Rocks of Britain."
20 Mem. Geol. Survey, pp. x , 102.
21 Proc. Geol. Assoc., Vol. xvii., pts. 9, 10, p. 416, etc.