90% 
On the Tertiary Formations of the Hudson. 227 
iuding the country people, on whose lands minerals are’ fre- 
quently found, by giving vague and equivocal answers, to 
their numerous questions, prompted by curiosity, or suspi- 
cion of the views of the collector. If the real value of the 
mineral, and the design for which it was obtained, were 
plainly and candidly told them, by all visiters and collectors, 
they would soon believe they had not been designedly de- 
ceived, and that the minerals were not obtained for the pur- 
pose of extracting silver or gold from them, and the disposi- 
tion to endeavour to extract either silver or gold from the col- 
lectors would give place to that generosity and hospitality, 
which would not only be a credit to themselves, but to the 
community in which they live. 
Providence, Oct. 11, 1825. 
P. S. The writer finds, in preparing his duplicates for 
exchange, that he has now upwards of 4000 fair specimens, 
labelled, wrapped in papers, and boxed, in divisions ready 
for exchange, consisting mostly of New-Engiand minerals, in- 
cluding all those lately discovered, mentioned in his cata- 
logue, which he would be glad to exchange for foreign mine- 
rals particularly; also for those of the middle and south- 
western states. 
5. ROBINSON. 
Ant. V.—On the Tertiary Formations on the borders of the 
Hudson river. By Joun Fincu, F. B. S., &c. 
Durine an excursion up the North river, a few months 
since, I observed some formations which may probably be 
classed with the tertiary strata of Kurope. They may be 
traced, on one or both sides of the river, from near West’ 
Point, to the city of Troy, and probably extend much further 
to the North; in width they vary from one to fifteen miles. 
The accompanying sketch represents their appearance 
at Hyde Park, near Poughkeepsie. The basin in which they 
are deposited, is formed by “a 
Transition Clay Slate, with strata inclined at an angle of 
35 to 45 degrees; the lamine of the slate form an angle of 
