134 Burton: Lincolnshire Coast Boulders. 
Scandinavian. Common on Holderness coast, and also found 
at South Ferriby Cliff. 
No. 4. A gabbro (5 x 24% x 14 inches) resembling No. 2, but 
finer than it. 
No. 5. A rhomb-porphyry (not known as such by English 
geologists)‘ rhomben-porphyr of Brégger’—a fairly well 
known rock north of the Humber. Mr. Sheppard has specimens 
from Burstwick and the Holderness coast. This specimen is 
Norwegian, there being nothing like it in England zm stu. 
No. 6. Amygdaloidal lava; each amygdule being a perfect 
agate and exceedingly pretty when examined under a good lens. 
This may come from anywhere, rocks of the type being found 
in several localities. It is well known north of the Humber. 
Nos. 7 and 8. Porphyrites of a somewhat similar type, 
resembling those from the Cheviots, but possibly Norwegian. 
No. 9. Millstone grit; probably from North-West York- 
shire. It contains small pebbles of quartz, felspar, and haematite; 
from which latter mineral it gets its prevailing colour. 
An igneous, pink, saccharoid rock (31% x2x 14 
‘uchiée), difficult to describe ; composed principally of a soft 
sandy substance, with crystals of mica quartz and felspar; 
probably very much weathered. 
No Resembling No. 1, though more compact and more 
waterworn. 
No. 12. Impure quartz, coloured with iron. Probably from 
same neighbourhood as No. 
0. 13. A very interesting specimen—not a granite, but a 
palzozoic, sedimentary rock, altered through shearing; the large 
grains of quartz being elongated in the direction of the shear. 
This direction can also be ascertained by the manner in which 
the sides of the specimen, once perpendicular, are distorted,— 
the large flat surface representing the original bedding. This 
specimen contains some beautifully tinted quartz specks, which 
resemble moonstones in appearance when wet. It isa palaozoic 
rock, and may come from the Lake District, but its habitat is 
not certain. 
No. 14. A rock composed of large crystals of hornblende 
and quartz (5 x 3x2 inches), with, here and there, fairly large 
crystals of golden mica; it occurs at times on the coast north 
of the Humber. 
Nos. 15, 16, and 17. The two first are mica schists, while 
the last, No. 17, is dices’ a mica or hornblende schist, oes ke. 
Broan ca ros « 
