132 
be brought to bear, and any one sufficiently versed in Miner- 
alogy, could at once determine what species were under 
examination. He had spent some time in investigations of 
this character, but the more particularly in the examination 
of fossiliferous rocks, and the results had been of so satisfac- 
tory a character that it was his intention to extend his labors 
ta the crystalline rocks, and, as opportunity offered, he would 
investigate in this way, the Sandstones of our immediate 
neighborhood. 
Pror. B. N. MARTIN, in continuation of this subject, made 
some remarks. 
He said that he regretted very much the absence of Prof. 
Wurtz, who would doubtless have offered, had he been 
present, some important suggestions in support of the views 
expressed in his paper. 
He had recently visited and examined the Palisade ridge, 
in company with Prof. Wurtz, who had pointed out some 
very interesting facts) Among these was the occurrence of 
a bed of truly Felspathic Sandstone, below the whole series 
of Trapoid Schists, and immediately above the Jasperoid 
Rock which covers the Serpentine at Hoboken. It is of the 
variety known as Arkose, and seems to be a disorganized 
and reconstructed Granite. It is composed of Quartz grains, 
cemented, apparently by Feldspar, without any Mica. This 
rock was found at Fox Hill, between the Serpentine outcrop 
of Hoboken, and the Trap Ridge west of that city, and is to 
all appearance largely composed of Feldspar. 
West of this, and the base of the Trap, the same rock was 
found in place, underlying the whole series of Trapoid 
Schists which form the hill. 
On examination of the Schists themselves, the lower ones 
were found to be most obviously stratified, lying in beds of 
a regular and uniform parallelism and dipping slightly 
towards the west. This stratified character was beyond all 
mistake, yet they presented no appearance of Sandstone 
whatever, but were apparently a compact and fine-grained 
Trap rock. 
