PALEOZOIC ROCKS, LISBURNE FORMATION AND FICKETT SERIES. 67 



In his field notes referring to this locality Mr. Maddren states that the lime- 

 stones forming the cliffs referred to contain corals and other fossils and also veins of 

 calcite. Fig. 1 (p. 40) is a profile section of the limestone and shale as sketched 

 by Mr. Maddren at a locality a short distance south of the point where the fossils 

 were found in place. The section includes Cape Lewis and Cape Dyer. So far as 

 known, however, no fossils were found in the limestone represented in it. Cape 

 Dyer is described as the sea terminus of a limestone range, about 1,000 feet in 

 height, which trends inland in an easterly direction, the rocks striking east and west 

 and dipping 35° N. In the valley between Cape Dyer and The Ears there is said to 

 be a syncline of shale containing an exposure of coal along a sea cliff that rises from 

 50 to 100 feet above tide. The occurrence of coal here would seem to indicate the 

 presence of some other horizon, probably Carboniferous or Mesozoic. According 

 to Mr. Maddren the limestone beds at Cape Lewis also dip north and expose a 

 thickness of S00 to 1,000 feet. 



We may also note that the Middle Devonian discovered by Mr. Spurr in south- 

 western Alaska." in the Kuskokwim country, is considered by Mr. Schuchert as 

 about the same as that on the Anaktuvuk. The same is true of the forms collected 

 by Mr. Brooks in southeastern Alaska.* 



Distribution. — The thickness of the Lisburne formation in the mountains on the 

 Anaktuvuk and at Cape Lisburne on the coast, and the important part it plays in the 

 constitution of the Endicott Range and the continuation of these mountains westward 

 to at least the one hundred and fifty-second meridian, as discovered by Howai'd,* 7 as 

 well as the general regularity in the disposition of the rocks, seem to render it 

 highly probable that that formation is continuous between the Anaktuvuk and Cape 

 Lisburne. Its lithologic resemblance to the limestones of the Bettles series on the 

 Koyukuk^ and the Devonian fossils found by the writer in the Chandlar River 

 district, and by Kennicott and McConnell farther east on the Forcupine, would lead 

 to the inference that the Lisburne formation, or at least the Devonian, forms a pretty 

 constant component of this northern Rocky Mountain range from Cape Lisburne 

 eastward throughout northern Alaska, for a distance of 600 or more miles, nearly to 

 the international boundary and probably beyond it. 



FICKETT SERIES (CARBONIFEROUS). 



Character and occurrence. — The Fickett series, so named from the Fickett River of 

 Allen (now called John River), comprises rocks of very diverse character, ranging from 



a Spurr, J. E., A reconnaissance in southwestern Alaska in 1898: Twentieth Ann. Rept. U. S. Geol. Survey, pt. 7, 1900, 

 p. 179. 



& Brooks, A. H., Preliminary report on the Ketchikan mining district, Alaska: Prof. Paper U. S. Geol. Survey No. 1, 1902, 

 p. 21. 



cStoney, Lieut. George M., Naval Explorations in Alaska, U. S. Naval Institute, Annapolis, Md., 1900, p. 70. 



dSchrader, F. C, Reconnaissance along the Chandlarand Koyukuk rivers, Alaska; Twenty-first Ann. Rept. 

 U. S. Geol. Survey, pt. 2, 1900, p. 475. 



