650 Granite at Mounts Adam and Eve. 



1. There is undoubted intrusive and true igneous granite present 

 in extended development. 



2. There are heavily metamorphosed white limestones invariably 

 next it, and they are charged with minerals peculiar to these con- 

 tacts elsewhere. 



8. The white lime graduates into blue, with transitional, graphitic 

 forms. 



4. The remote blue limestone show^s no metamorphism, and the 

 same belt in New Jersey contains Cambrian fossils. 



The only locality where fossils were found in the area mapped 

 was in a limited outcrop of blue limestone just north of the 

 Lehigh and Hudson River K. B., between Warwick and Stone 

 Bridge, where several easterly dip and strike symbols appear on 

 the line of Section 2. The layer in which they occur consists 

 of a purplish shale, immediately ^overlying a hard band of cherty 

 limestone. The fossils are exceedingly fragmentary and difficult to 

 determine with accuracy. They consist principally of bryozoans, 

 leperditige, molluscs, and detached portions of trilobites. 



The bryozoans are indeterminate. In the trilobite remains we 

 may recognize provisionally a Dalmanites, and in the Tjeperditise we 

 have either L. alta or one closely allied to it. Meristella Imvis, 

 Nucleospira ventricosa and Coelospira concava are the only mol- 

 lusks which can be determined with any degree of certainty. From 

 this unsatisfactory material we can only infer in a general way that 

 this portion of blue limestone represents the lower Helderberg 

 horizon. Our failure to find fossils in the other blue limestone areas 

 examined prevented the determination of their relations, but as we 

 did not specially search for them, they may yet be discovered. 



The only indication of organic matter in them which we met, or 

 in the white limestone, was the occurrence of graphite. In this con- 

 nection it is of interest to note that throughout the white limestone, 

 wherever slips or shear planes were found, the graphite was flat- 

 tened and extended into long ribbon-like streaks, in the direction of 

 the slipping or shearing, which were hardly to be distinguished, so 

 far as appearances are concerned, from Archeeophyton Neivberrya- 

 nvm, described by Dr. N. L. Britton, from the white crystalline 

 limestone of Sussex Co., N. J.^ 



1 Annals N. Y. Acad. Sci., iv, 123, 124, pi. vii. 



