65 
that on which the conglomerate rests. The conglomerate outcrops 
broadly south of dike 35, forming a low hill; and a few streaks 
of sandstone show that the bed dips southeast about 10°, so 
that the thickness can scarcely exceed 25 feet. It is distinctly 
overlain on the southeast corner of the outcrop by a second 
flow of amygdaloidal melaphyr. The surface of the ledge 
slopes with the dip, and thus a thin layer of melaphyr covers 
quite a breadth of the conglomerate. A small triangular patch 
of the overlying melaphyr is also seen resting on the conglom- 
erate immediately north of dike 35, indicating, apparently, a 
slight fault with the downthrow to the north on the line either 
of this dike or of the small dike (36) which is, probably, a 
branch of the main dike. 
3 
№ 
X 
yy 
n ND e 
N Conglomerate. N 5. 
Melaphyr. Conglomerate. 
Fic. 6.—SECTION SHOWING THE FAULT-DIKE (31) AND THE CONTACT 
BETWEEN THE SECOND MELAPHYR AND THE FOURTH CONGLOM- 
ERATE, NORTH OF THE FAULT. SCALE, I INCH 3O FEET. 
Between dikes 29 and 31 the conglomerate erosses the north- 
south fault bounding Melaphyr Plateau and extends eastward 
into the melaphyr about 100 feet with a breadth of 75 feet. 
This extension, being on the upthrow side of the fault, is ele- 
vated above the rest of the bed some 20 feet. At its south-east 
Corner the extension is overlain by amygdaloidal melaphyr of the 
Same character, in precisely the same manner and with the same 
southeasterly dip (10-15) as at the southeast corner of the 
lower area. The extension is undoubtedly cut off by а fault 
on the south, with the. downthrow in that direction, so that 
the contact of the conglomerate and overlying melaphyr in the 
OCCAS. PAPERS. B. S. N. H. IV. 5. 
