146 REPORTS ON THE STATE OF SCiENCE.—1913. 
2. Maple Avenue, Bishop’s Stortford. (Rubble-Drift.) 300 feet. 
(O.D.) All derived immediately from the glacial drift of the 
Herts plateau. 
Phyllite (subangular), fragment of a larger slab (3 in. by 2 in. by 
2 in.): derived from the older and higher ‘ Drift’ of the Herts 
plateau. This specimen strongly resembles some of the highly 
altered bedded ‘ ash’ of Snowdonia. 
Dolerite: bomb (broken), 2 in. in diam. 
Flint: extremely weathered and devitrified (cortex of one extensively 
flaked), probably result of Miocene weathering of the quondam 
‘Mercian’ chalk. (See Report in the 1911 volume, pp. 131 ff.) 
Limestone: vermiculate, weathered, probably from the Cornbrash 
or the Lias (6 in. by 5 in. by 2 in.). 
Sandstone, cuboidal block, very hard and fine-grained 
(24 in. by 2 in. by 2 in.): Rothliegendes (?). 
The erratics found here have mostly been obtained in the excavations 
connected with the horse skeleton described at Sheffield (in 1910), 
with further comparative anatomical notes at Portsmouth (1911), 
Section H ; see also Report tothe Special Committee in the 1911 Report 
(pp. 131 ff.). As a whole erratics from this source are far more exten- 
sively ‘ weathered’ than those found in the Harlow Till, the Chalky 
Boulder Clay of the lower plateau, and the still younger Valley Boulder 
Clay at Thorley, where it is intercalated with the contorted gravels. 
3. Hockerill Vicarage. (Excavations in Rubble-Drift.) 230 feet to 
240 feet (O.D.). 
(a) Quartz-porphyry: deeply weathered on exterior. Felspar more 
or less kaolinised throughout, suggesting a Bunter pebble 
(4 in. by 3 in. by 1} in.). 
(b) Quartz-porphyry: slab-like, subangular; more felsitic in texture 
than (a), slightly kaolinised. 
Dolerite (3 in. by 24 in. by 14 in.): and several smaller fragments. 
Hypersthene Andesite: several fragments. 
Basalt: several fragments. 
Rételschiefer (3 in. by 3 in. by 14 in.) from Rothliegendes. 
Rhazella Chert (4 in. by 2 in. by 3 in.): several smaller fragments. 
4. Hallingbury Road. (Gravel-pit) (B.S. Urban Dist. Council.) 
Quartz-porphyry (3 in. by 3 in. by 13 in.). 
Bedded Ash (6 in. by 5 in. by 8 in.). 
Same with included fragments (8 in. by 2 in. by 1} in.). 
Pale@ozoic Conglomerate (5 in. by 4 in. by 3 in.). 
Silicified Wood (?) (8 in. by 4 in. by 3 in.). 
Boulder of vein-quartz (7 in. by 4 in. by 3 in.). 
Several blocks of millstone-grit and of older grits (probably of 
Cambrian age). 
All from the ‘ interglacial sands,’ 210 feet to 230 feet (O.D.), which 
are strongly current-bedded: probably dropped by ice-rafts. 
Reported by Mr. THomas Suevparp, F.G.S., F.S.A. 
Excavations continue to be made in the gravel pits at Burstwick 
and Kelsey Hill in Holderness. In the latter pit enormous quantities 
