Cote—The Rhyolites of the County of Antrim ; with a Note on Bauxite. 83 
plane of faulting, along which the basalt, gravel, and rhyolite have become 
dragged out and intermingled. On this plane the basalt and chalk come at one 
point into contact, without the interveution of rhyolite or flint-gravel. 
The occurrence of a fault here in no way affects the question of the intrusive 
nature of the rhyolite. The layer of gravel above the rhyolite is distinctly 
indurated by it, the junction being marked by a continuous band of reddened 
flints, about an inch thick, which is unlike any other layer in the gravel. An 
unusual number of small cracks traverse the interior of the flints that lie along this 
upper plane of contact. 
The gravel is less continuous on the under side of the rhyolite, between the 
latter and the chalk, and occurs more in lumps and patches; this feature is 
repeated, but on a bolder scale, at the east end of the quarry-section. 
Scale of Decimetres 
Fie. 2. 
Detail of section at west end of Templepatrick Quarry. 
B—Basalt. C—Chalk, much disturbed near junction. D.R—Decomposed Rhyolite. F F—Supposed Fault. 
G—Altered Flint-Grayel and Dark Clays. R—Rhyolite. 
The details of that part of the western section which lies below the letter B in 
Mr. M‘Henry’s drawing afford interesting evidence of the relation of the rhyolite, 
not only to the gravel, but also to the basalt. A lenticular lump of basalt, of the 
same character as the main mass above, occurs there almost surrounded by 
rhyolite (fig. 2). The latter rock is greatly decomposed between the upper flint 
gravel and the lump of basalt, and forms a greenish and whitish friable mass. But 
it is continuous with a rock on the right, which is clearly the rhyolite iz situ, and 
also with the fluidal rhyolite below. The clay-filled crack, above referred to, 
crosses obliquely upwards from the basalt-lenticle towards the brecciated prolonga- 
tion of the rhyolite. Careful examination of the pale friable material above the 
lump of basalt shows that it consists largely of greenish clay, similar to that which 
