50 
LITHOLOGICAL NOTES ON BOTTOMS DREDGED OFF 
NORTHUMBERLAND. 
By Prof. G. A. LEBOUR, M.A., M.Sc., F.G.S. 
The samples were collected at the dredging excursions made in 
1901 and 1902, and the stations are shown in Chart I. 
A. — Muddy sand. The quartzoze grains are mixed with decomposed 
grains of dark rock, apparently broken slaty greywacke. A good 
deal of fine clay is present, and a few minute grains of magnetite 
and of some other (non-magnetic) iron ore, probably ilmenite. 
Very little mica. 50 fathoms. 
B. — Muddy sand, with fragments of shells. Very like A, but with 
additionally, some microscopic dark green grains, apparently of 
glauconite. 59 fathoms. 
D.— Light-coloured muddy sand, quartz, felspar (plagioclase), and 
a little muscovite. A little magnetite in very minute grains. 
89 fathoms. 
F. — Sandy mud. Much mica (both Biotite and Muscovite) present. 
Clayey portion ferruginous, no magnetite found. 39 fathoms. 
G. -Very like F, but less micaceous. 39 fathoms. 
H. — Rather muddy sand. Chiefly made up of quartz grains, with a 
considerable admixture of clinker fragments. No magnetite. 
30 fathoms. 
J. — Sand only, slightly muddy, with very small pebbles of rolled 
igneous rock. Clinker in small fragments. 21 fathoms. 
M. — Shell sand, with numerous entire shells, chiefly minute (see 
accompanying list by Miss M. V. Lebour). Some quartz 
grains, clinker fragments, and mica. Practically no mud. 42 
fathoms. 
N. — Shell sand, coarser than M, with larger fragments of shells and 
fewer entire specimens (see list). A little quartz sand, and some 
clinker fragments. Also one largish fragment of jasper. 52 
fathoms. 
