Geology and Mineralogy. 505 
12. Esteville, Ky., Va., Tenn., by M. R. Campbell, B. Willis in 
charge 
The following folios are also ready for distribution : 
13. Fredericksburg, Md., Va. 
14. Staunton, Va., W. Va. 
15. Lassen Peak, Cal. 
16. Knoxville, Tenn., N. C. 
17. Marysville, Cal. 
18. Stuartsville, Cal. 
19. Stevenson, Ala., Ga., Tenn. 
20. Cleveland, ‘Tenn. 
They are prepared by the U.S. Geological Survey and may be 
had for the price of twenty-five cents each from the Director of 
the Survey. ‘The sheets of the Atlas began to appear in 1873. 
H. Ss. W. 
3.'Heonomic and Geologic Map of New York WState.— 
Mr. F. J. H. Merri, the Director of the New York State 
Museum, has prepared a small map, on a scale of about 14 miles 
to the inch,in which are indicated by colors and symbols the 
geological formation and the localities of economic minerals of 
the state. The geological features are based upon the map of 
1844, with additions and corrections derived from maps and 
papers more recently published, and the unpublished material fur- 
nished by H. P. Cushing, W. B. Dwight, H. L. Fairchild, P. F. 
Schneider, F. J. H. Merrill, C. S. Prosser, Heinrich Ries and C. H. 
Smyth, Jr. The chief modifications of the geology from the older 
maps are seen in the areas of Cambrian and Pre-Cambrian, and 
of Devonian. In regard to the former the recent clearing up of 
the ‘Taconic controversy ” has resulted in a more accurate 
delineation of the areas along the eastern border of the state. 
The results of recent studies in classification and areal distribu- 
tion of the Devonian formations, is seen in the more accurate 
delineation of the areas of its three chief formations; the Upper 
Helderberg, Hamilton and Chemung. We notice that no attempt 
is made to distinguish the Olean from the underlying Upper 
Devonian formations, and a single color is used for all the forma- 
tions from the top of the Hamilton upward to the Carboniferous, 
The upper limit of the Hamilton is evidently traced through the 
central part of the state by the Tully limestone, and as this is 
wanting in the western and eastern parts of the state, the limit 
is apparently placed at the point in the succession where the first 
representatives of neo-Devonian faunas begin, rather than where 
the meso-Devonian species cease. ‘This draws the line at the one 
point in the series where the faunal change is evident in such 
sections as lack the lithological change from shales to limestone. 
If geologists, studying this part of the series, will bear in mind 
that the Tully limestone faunally belongs with the upper 
(Chemung) rather than with the lower (Hamilton) faunas, they 
will not be confused in determining their horizon in Chenango 
County and the counties eastward, where the Tully limestone 
