242 
LAMPLUGH: GLACIAL SECTIONS. 
Road, cla3^e3^ sand with gravel streaks, sometimes to bottom. 12- 
14ft., but often on boulder cla}^; beyond Tenny Lane, red boulder 
clay with ashy partings comes to surface; approaching- Promenade, 
fresh -water marl and gravelly sand come on above ; 6 to 14ft. 
Carr Lane and Sewerby Crescent, Bridlington Quay. Fresh-water 
marl intermittent, over chalk}^ gravel ; over boulder clay in 
places ; 4 to 10ft. 
Gliapel Street, Bridli7igton Quay. Boulder clay generally to top, but 
a few hollows filled with marly wash ; about 10ft. 
Grundale Terrace, Hilderthorpe. Fine chalky gravel with sand, over 
boulder clay ; about 7ft. 
Detailed Descrijotion. Commencing at the top, a noteworthy 
feature in certain places, especially in the old town of Bridlington ; 
in the neighbourhood of the church, where an old priory once stood, 
is the depth of the top soil and disturbed ground, consisting of black 
vegetable humus with many fragmentary bones apparently of 
domestic animals. This has evidently formed an old marsh in wet 
times ; and in Saint John Street, at the point marked Z on the ground 
plan, a number of big drift-boulders were found, which seem to have 
formed stepping stones. In other places, rough pavements made of 
similar material were cut through; and in Westgate, an old road 
was uncovered three feet below the present surface ; it was overlaid 
by 18 inches of silty marl. 
The Fresh-water Marls (No. 1 ). These marls occupy the low- 
lying parts of the town, and do not occur at higher elevations than 
about 40ft. above the Ordnance Datum line, though there is occasion- 
ally a loose silty wash above the lower beds at slightly higher levels. 
This wash probably indicates the margin of the shallow lake in which 
the marls were formed, whose borders would, from the character of 
the underlying beds, be subject to great fluctuations according to 
season. 
In the sections between Bridlington and Quay the marls seem 
to pass into, or under,* the fine chalky gravel. No. 2, which reaches 
* This point is left doubtful by an unfortunate hiatus in my sections, a few 
yards of trench near Y in Plate 1. Fig. 2, baring been filled in before I could 
examine it ; the contractor informed me the marl here rose, from the bottom of 
the drain, as shown by the dotted lines, but I do not feel certain on the matter. 
