280 =. € Russell—Triassic Trap Sheets of New Jersey. 
formation of New Jersey—where it approaches the trap is con- 
siderably altered and forms a mass of semi-crystallized carbon- 
ate of lime. : 
cia have been filled by infiltration with calcite and zeolites. 
This interesting material seems to have a history somewhat 
similar to that of the “ friction breccias,” mentioned by Von 
otta, as occurring at the margins of eruptive igneous rocks, 
and formed at the time of their eruption. ; 
the igneous 8, composing the First Newar n, were 
intruded in a molten state between the layers of the stratified 
r subsequent to their consolidation. As these mountains 
may be that one is thousands of years older than its neighbor. 
As regards the conformability of the trap sheets with the 
associated sedimentary rocks, we have but little information to 
offer, independent of the section at Feltville which we have 
already described. The curved course which a number of the 
trap ridges in New Jersey follow, seems to indicate that they 
ust cut across the strata of the sedimentary rocks, which, 
throughout the whole Triassic area in New J ersey, have a 
nearly uniform dip of from twelve degrees to fifteen degrees 
toward the northwest. 
