388 
The American Geologist. 
June, 1905 
as to occasionally lose something in clearness. Four diagrams 
furnish graphic illustrations of the principles presented. 
The discussion has an immediate bearing upon the inferences 
that may be drawn from contact surfaces, of the character of 
former land surfaces and ably calls attention to a factor which 
has been more or less overlooked, in making such inferences, f b. 
Geologic Map of the Tully Quadrangle [New York]; Bulletin N. Y. 
State Museum 82, 1905; John M. Clarke and D. Dana Luther. 
The New York State Museum has recently published two bulle- 
tins containing descriptions of the formations found on three quad- 
rangles of that state accompanied by geologic maps. Bulletin 81, 
in which the formations of the Watkins and Elmira quadrangles in 
southern central New York were described and mapped, was re- 
viewed in the American Geologist last November. 
The Tully quadrangle is located in central New York directly 
south of the Syracuse quadrangle in the third district of the 
original survey, which was described by Vanuxem in his final re- 
port of 1842. A comparison of these maps with the state one of 
1842, shows at a glance the great development in our knowledge 
of the geology of New York state during the last 60 years. The 
quadrangle is easily reached from Syracuse and on this account 
it will be of special interest to the students of geology in that city 
and its University. 
The rocks shown upon the may belong to the Upper Silurian 
and Devonian systems which the authors have represented by 18 
divisions and grouped them as follows: 
Neodevonic -, Senecan { 
Ithaca sandstone and shale 
Sherburne .flags 
Genesee shale 
Tully limestone. 
Mesodevcnic ■{ 
Erian 
Ulsterian 
[ Moscow shale 
I Ludlowville shale 
J Skaneateles shale and limestone 
I Cardiff shale 
I Marcellus shale. 
Agoniatite limestone 
Onondaga limestone. 
Paleodevonic 
Silurlc 
or 
Ontario 
iOriskanian 
Helderbergian 
r 
{ Cayugan 
i 
Oriskany sandstone 
Helderberg limestone. 
( Manlius limestone 
I Rondout waterlime 
■J Cobleskill dolomyte 
I Bertie waterlime 
[ Camillus shale. 
In the description of the units of sedimentation the lithologic 
