495 
Dr. Berger’s Account of the Isle of Man . 
to any particular lamina may be traced for some extent, though 
thus confusedly disposed. 
If I mean the same as that to which Dr. Berger alludes, when 
he says there is a sandstone overlying the limestone along the 
Castletown river, it is a breccia, which forms a hill immediately to 
the south of Athol bridge, consisting of angular fragments of quartz 
in a basis resembling that at Langness, but the ingredients are not 
so large or the texture so loose. 
A breccia composed of angular fragments of limestone and quartz 
pebbles, loosely cemented by sand and calcareous matter, overlies 
the limestone at Caal Ferrane. This bed is not seen on the shore 
below high water mark, owing to the facility with which it becomes 
disintegrated by the tide. 
The sand and gravel, which compose the high cliffs of diluvial 
detritus, towards the north of the island, are in many places 
agglutinated into sandstones and breccias by a calcareous cement 
which appears to pervade the whole of this tract to a great extent, 
so much so, that the roads, repaired with sand from this quarter, 
soon become hardened after a few showers. Fragments of shells 
and some nearly perfect specimens of recent cerithea, often 
occur sticking in the sandstone, and probably the whole of the 
calcareous matter here may be derived from this source. 
AMYGDALOID. 
From what Dr. Berger says of this formation, we might be led 
to suppose that the whole space between Scarlet and Poolvash was 
composed of a bed of amygdaloidal trap, which is not the case. 
The great mass of the formation is a trap-tuff of loose texture. 
Towards Scarlet it rises higher, becomes more compact, and acquires 
Vol. V. 3 R 
