338 



E. II. Kindle— Fawnal Succession in the 



than the limestones but disagree as to the character of the con- 

 tart between the two series. Collier* at first believed the two 

 terranes to he unconformable hut later found evidence of fault- 

 ing at the contact, while Knopff reports a transition zone into 

 the slates at the base of the Port Clarence. An explanation 

 of the relationship of the two terranes which seems to require 

 more careful consideration than has been given it, is that of 



Fig. 2. 



Fig. 2. Typical view of the Port Clarence limestone near Cape York. 



faulting. Conclusive evidence regarding the order of succes- 

 sion of these beds apparently must await the discovery of 

 fossils in the black slates. 



On the eastward the limestone of the type region of the 

 Port Clarence is limited areally by a series comprising slates, 

 schists, greenstones and undifferentiated limestones. This 

 series is supposed by the geologists,:}: who have mapped this 

 area, to precede the Port Clarence limestone in this section. 

 Two small areas of noncalcareous rocks, mostly slates, lie like 

 islands in the midst of the Port Clarence limestone area. One 



*Prof. Paper TJ. S. Geol. Survey, No. 2, p. 18, 1902. Bull. U. S. Geol. 

 Survey, No. 328. p. 72, 1908. 



t Bull. U. S. Geol. Survev, No. 358, p. 13, 1908. 

 {Bull. U. S. Geol. Survey, No. 328, pp. 69-79, 1908. 



