4:4 The American Geologist. July, i892 
raised and depressed und eliuiates have changed ; and such l)eing 
the case it seems reasonably certain that sediments derived from 
secularly decayed soils must be abundant in the formations of the 
dilTerent ages. All the conditions for such accumulations have 
been present, and if the line of reasoning adopted in this essay is 
not fallaceous they must exist. The work of discovering evidence 
of them in the field yet remains to be done except in a very few 
cases. 
NOTES ON SOME PSEUDOMORPHS FROM THE 
TACONIC REGION. 
By Wm. H. Hobbs, Madison, Wis. 
(Puhlished with the permission of the Director of the U. S. Geological Survey.) 
The pseudomorphs here considered occur in northeastern Con- 
necticut near the Massachusetts state line, within an area of 
crystalline rocks which are now being studied by members of the 
U. S. Geological Survey. 
Tremolife Pseud omorplm afUr SaHte. 
The crystalline dol()mitic limestone of the vicinity of Canaan, 
Ct. , has long bean known to collectors as a locality for white 
pyroxene and tremolite. Well terminated crystals of the former 
are figured in 8hepard's Mineralogy.* 
In a recent paper Prof. G. H. Williams has described hemi- 
hedral pyroxene crystals from Canaan and mentioned an incipient 
uralitization of the mineral.! 
I have found pyroxene crystals to be abundant in the dolomitic 
limestone at numerous localities extending from Canaan north- 
ward 'through the valley of the Konkapot river (Mill river), at 
Konkapot, Mill river, Hartsville, and Monterey. They are known 
to the quarrymen under the name, "Jason's Teeth." 
Their distribution seems to be confined to the region east of 
the Housatonic river. They are usually from one-half of an inch 
to an inch in length and stoutly columnar, Imt they also attain di- 
mensions of several inches. Sometimes they are found in large 
*Vol. II, p. 133, 1835, figures 353 and 354. 
fAm. Journ. Science, xxxviii, p. 115 and Fig. 8, August, 1889. 
