Limestone Belts of Westchester County, N. Y. 361 
142d street, and at many points to the north. The eastern 
and western lines become united in one wide belt in Morris- 
ania which continues northward through Tremont to Fordham. 
Toward Harlem River the interval between these two lines is 
limestone of the belt divides pee te as the facts appear to 
show, the axis of the fold has a small northward pitch. This 
division of the limestone to the south into two bands, an sataphs 
and western, separated by intervening schist, would come from 
the we pete. ‘down of such a fold to a horizontal i ag 
to represent an anticlinal fold with an inclined axis but vertical 
axial plane, in which layers of nails are enveloped by a stratum 
of prt In the pee? section, e fg, the cmtone of 
the two sides is in one connected mass from ¢ to m, but in two 
bands separated by interv eer esc from m to fg. The same 
also is shown in the section a 
Professor Gale states" that the gneiss along 4th avenue from 
118th to 120th street is in places half limestone; and Professor 
D. S. Martin has obse Bre the same on. 194¢h street ; and 
these localities are in a hes with the Mott Haven and Tremont 
belt, and indicate its southward oe into New York 
Island, as recognized by Mr. R. P. Stevens.’ 
This Tremont belt is widened on its eck side in Morrisania, 
over Fleetwood Park, in consequence of a second anticlinal 
(see map), but one having the axis inclined southward, or in the 
opposite direction from that of the main belt. That the axis 
has this inclination is shown by the strike and dip of the mica 
schist which divides the northern end of this western exten- 
sion, and its widening northward. Ata section of the schist 
on the north side of the He the dip is in opposite directions ; 
'® Mather’s N. Y. Report, 
™ Proc. Lye. Nat. Hist. el York, 1871, i, 222. 8 Annals, ibid., viii, 116. 
