Geology and Mineralogy. 233 
an average, thus making the rock very sparsely porphyritic; and 
Mr. Hawes in his former Je in which the locality and rock 
characteristics are rightly given) remarks that it crystallized out 
from the mass of the rock behatine of its different composition ; 
aha has since siriitly observed, it was first to cr iE yetnliae because 
Tae sey es than the rest of the felds spar portion 
Th ss of the rock, containing none of the an sheen Dies 
was analyzed by him separately and his results are t f No. 
3 in the last able: they show a very near identity with the West 
Rock trap. 
It appears, hence, that Dr. Hawes’s recognition of anorthite as 
a prominent ingredient of the West Rock trap was not warranted 
y 
constituent has as yet dailies g to sustain it; and that the Mesozoic 
trap of eastern North America still needs careful investigation. 
. New Devonian Plants.—Dr. Dawson read before the Geo- 
logical Society of al June 23d, 1880, a paper describing sev- 
eral new North American Devonian plants, as follows: A pier 
Tree-fern, Usteropieis. Noveboracensis, characterized by an axial 
cylinder composed of radiating vertical plates of dint sired eledues 
imbedded in parenchyma, and surrounded an outer cylinder 
penetrated with leaf- bundles with dumb- * whet et fore bun- 
dles, from the Upper Devonian of New York; a species of Hgui- 
setites (EZ. ib, be ae gr showing a hairy or ‘pris stly ma and 
sheaths of about twelve, roby acuminate leaves; a specimen of 
wood, new in its characte 8, fro om the Devonian of New York, 
named SGnaogind, te prineouin, and having some analogies s with 
Prototaxites and w phyllum paradowum of Unger; also sev- 
eral new fern froth: fhe well-known Middle Devonian plant-beds 
of St. John, Now Brunswick, confirmatory of the previous con- 
clusion as to the age of the beds, and showing the harmon 
their flora with that of the Devonian of New York, “abt also ‘the 
fact that the flora of the Middle and Upper Devonian was em 
nently distinguished by the number and variety of its species of 
pots both herbaceous and arborescent. 
6. On Fossil Plants from the ad Tertiary pA de Be 
Roches Porcée ées, Souris River, a diay r. J. W. Daw 
(Canadian N aturalist, Jan. l Daieion states in “his 
age that the Lignite Tert reise raved of Manitoba and elsewhere 
n the Western Plains rests immediately on the Upper Cretaceous, 
‘at holds extensive deposits of valuable lignite, associated with 
shale and sandstone containing numerous remains of plants. This 
Tertiary ages. The species of plants were collected by Mr. 
of aan. Hampshire Geol. Bei peer uy" iii, p. 92. He says, speaking of a similar 
case in New Hampshire ‘or the occurrence of the anorthite in large 
isolated er ystals is “t that ae lame is much less fusible ; hence in rocks dusiod 
from igneous fusion, the anorthite would ¢ erystallize first, a and would have an 
°pportunity to form larger crystals in the still plastic mass.” 
