SLATE DEPOSITS AND INDUSTRY OK UNITED STATES. 89 
UTAH. 
By Edwin C. Eckel. 
For some years past a small amount of slate has been annually gotten out, chiefly 
for samples and trial shipments, at various points in Utah. Deposits of slate, believed 
to be of workable extent and of good quality, have been described as occurring on 
the islands in Great Salt Lake, and some attempt has been made to develop these 
deposits. 
The locality which has been most widely discussed, however, is that near Provo. 
This has been exploited to some extent by F. W. C. Hathenbuck, of Provo. The 
slate deposits occur about 2 miles southeast of Provo station, in Slate Canyon. The 
slate here covers a considerable area, but that exposed at the surface is so badly 
broken up that large slabs-can not be obtained. It is possible, however, that this 
condition will disappear if the deposits are worked deeper. 
The Provo deposits furnish green and purple slates, the latter being apparently 
present in greater quantity. The green slates show little tendency to cleavage in 
their surface outcrops, and will probably be less satisfactory for rooting purposes than 
the purple. The green slates rub very smooth, however, and would make good slabs 
or mill stock if obtainable in masses of sufficient size. 
The purple slates split well, with a surface about as smooth as that of Peach Bot- 
tom (Pennsylvania-Maryland) slate. From samples seen it appears that they also 
bear punching well. 
A specimen of the purple slate selected by the writer was analyzed by Mr. W. T. 
Schaller in the laboratory of the United States Geological Survey, the results being 
as follows: 
Analysis of purple slate, Provo, Utah. 
Silica ( SiO, ) 54. 05 
Alumima ( A1 2 3 ) - 20. 95 
Iron oxides (FeO, Fe 2 3 ) 28 
Lime (CaO) 22 
! Magnesia (MgO) 9. 12 
Carbon dioxide (C0 2 jl 
| Water 
Of a series of 36 analyses of American rooting slates collected and discussed" 
recently by the writer, the above slate from Provo stands lowest in its percentages of 
silica and magnesia, while its lime is very far below the average. 
Nothing definite is known as to the geologic age of these slates, though they are 
supposed to be Ordovician, or even older. 
VERMONT. 
By T. Nelson Dale. 
GEOGRAPHICAL RELATIONS. 
There are at least four distinct slate districts in Vermont. The most easterly 
extends along the Connecticut Eiver for more than two-thirds the length oi the 
State. The slate is black or dark gray, and has been worked in Guilford, in Wind- 
ham County, at the extreme southern end of the State, and also in Thetford, in ( Grange 
County, and at Waterford, in Caledonia County. The next extends along the east 
flank of the Green Mountain range from the Canada line to about the middle of the 
ajour. Geol., vol. L2, 1904, p. 26. 
