242 BULLETIN OF THE 
indicate something with regard to relative ages. The effusives are fine- 
grained olivine diabases, in which the augite crystals are much decom- 
posed. The freshness of the dike rock would indicate that it is much 
younger. 
Most of the basic dikes of the Eastern United States previously de- 
scribed, and having a near relation to the above, have been Campton- 
ite ; in Northern New Jersey, however, some dikes have been noted by 
Prof. J. F. Kemp, which he decides are practically identical with the 
Ouachitite of Arkansas, and with the Ouachitite the relation of the Con- 
necticut dike is close. If this Triassic dike rock is finally placed in the 
Fourchite group, it will be the second occurrence outside Arkansas of 
the rocks of the group. 
1 Arkansas Geol. Survey, Ann. Rep., 1890, Vol. II. p.403. Also Am. Jour. Sci., 
April, 1893. 
PrETROGRAPHICAL LABORATORY, HARVARD UNIVERSITY, 
June, 1893. 
