208 Dr. J. S. Newberry on Ancient Vegetation of N. America. 7 
sults of the analyses of the Bergen Hill pectolite than any yet 
proposed. As written here, its relations to that of spodament 
are to be noticed, as also to those of Wollastonite and pyroxent — 
The latter connection will be made plainer by writing the fr 
mula of pectolite thus: a i 
RF Si*, 
R being (Cat + Nad + H}). 
Northampton, Mass., Feb. 1859. 
Arr. XX.—Notes on the Ancient Vegetation of North Amerioa; 
by Dr. J. S. Newserry. In a letter to Prof. DANa, 
Santa Fe, New Mexico, Oct. 15th, 1859. 
Dear Sir :—I have just returned to Santa Fe after an one ’ 
of three months, spent in an examination of the geologi ie 
do rivers, in Utah and New Mexico, connected — Tope’ 
Department topographical survey under Capt. Macomb, 
ngrs. tg=beat 
The region visited proved interesting in many respec area with 
tifully picturesque and unexpectedly productive—cov’ pees 
ruins, and once densely populated by a race that has 
tirely abandoned it. ; ble phys 
I would cheerfully give you a sketch of its remarka oa “i 
eal and geological structure, but the results of the ex tment, 
will doubtless be published in detail by the War De be givet 
and it is not proper that any part of them should tf 8 Geld of 
to the public. I will say however, in general, that 00 ee 
rie 
series to the summit of the Cretaceo thicknes> 
the base 
reise us, These 
are conformable throughout, and over 10,000 feet 10 
