Ne ee eee 
<. 
M. E. Wadsworth—Rocks of Newfoundland. 95 
preserved. This lava evidently was very pasty,'and the flows 
ave a contour and surface that reminds one very strongly of 
the recent lava flows of the Sandwich Islands. I have no doubt 
that the eruption was of the same quiet kind, and the lava a 
basalt of the same character as that now poured forth from 
Kilauea. 
The structure of these lava flows can be well seen at the 
localities known as Great Lobster Cove, Break Heart Point and 
Taylor's Nose. At the latter a fissure forming a cave by the | 
sliding of one side of the mass, with the subsequent sea action, 
admits us into the interior of these flows, where the same 
structure of a series of pasty flows—one above the other—is to 
be seen. 
being still preserved. ile indeed other flows may have 
been removed, one thing is certain, the present surface is now 
the surface of a flo ot a trace of glaciation could be 
One of the projecting rounded knobs of the above mentioned 
ava was procured. This is a fine-grained greenish-gray rock 
weathering brown and holding small porphyritically inclosed 
crystals of feldspar. The section (860)* is composed of an 
earthy gray groundmass holding porphyritic feldspars. The 
groundmass is made up of a dirty gray fibrous and granular 
mass, formed undoubtedly from the alteration of a glassy or 
globulitic base, and inclosing numerous minute ledge-formed 
_ basaltic plagioclase crystals. Some viriditic or greenish mica- 
ceous material of a secondary nature occurs, as well as traces 
of ferruginous granules derived from the alteration of magnetite 
grains. A few augite grains together with some pseudomorphs 
after olivine were observed. Excepting the secondary changes, 
this lava is in microscopic structure strikingly like that from 
the eruptions of Kilauea in 1872, the microscopic characters 
thus supporting the field observations. This rock is here 
thpaedad. 
. ? 
in Museum of Comparative 
as formed from a viscous glassy lava—a basalt, whose 
* The numbers correspond to the numbers of rocks in the Whitney Lithological 
Collection ive Zodlogy. ghee 
