CAMBRIAN AND LOWER ORDOVICIAN. 155 



Q 3. SEWARD PENINSULA. 



(See 0-R 2-8, Alaska, Chapter VII, pp. 353-354.) 



Q, 5-6. ENDICOTT RANGE, NORTHERN ALASKA. 



(See 0-R 2-8, Alaska, Chapter VII, pp. 353-354.) 



S 27. EASTERN COAST OP GREENLAND. ^ 



(See Chapter IV, p. 224, description by Nathorst.) 



T 17-18. ELLESMERE LAND. 



The following notes on the occurrence of Cambrian and Ordovician strata are 

 quoted from Schei : ^^'"' 



■At Cape Camperdown, on. Bache Peninsula, is found granite overlaia by an arkose-like 

 conglomerate sandstone, in. fiat strata, the dip beiag north-northwest. Its thickness here prob- 

 ably does not exceed 500 feet, though the contour swells to considerably greater magnitude by 

 reason of intrusions of diabase, occasioning an additional thickness of perhaps 300 feet. At its 

 upper part this sandstone merges gradually, by interstratification, into a series of gray sandy 

 and marl-like schists and limestone conglomerates. From a few inches up to a couple of yards 

 in thickness these conglomerates and schists, continuously interstratified, buUd up a series 600 

 to 900 feet in thickness, interrupted by two compact beds of yellowish-gray dolomitic limestone 

 about 150 feet in thickness. These again are overlain by a series similar to the underlying one, 

 excepting that here the limestone conglomerates exceed the schists. 



In a detached block, in all probabiUty origiaating from one of the two 150-foot beds, were 

 traces of fossils, of which one, Leptoplastus sp., can be identified. In another detached block, ' 

 whose mother rock is not known, was found Anomocare sp. It may be said with certainty 

 after the finding of these fossils that this series contains deposits of the Cambrian age. 



The second series of conglomerates is overlain by a light grayish-white limestone in a bed 

 some 300 feet in thickness, observed in the midst of the section of Cape Victoria Head. Indis- 

 tinct Orthoceras, Lichas, and Symphysurus assign this limestone to the Lower Silurian period. 



Above the Orthoceras-bearing light-colored limestone bed are some less extensive strata 

 of alternating limestone and quartz sandstone, and finally a 100-foot bed of close brown lime- 

 stone of which certain layers are fossiliferous and gave an Asaphus, traces of other trilobites, 

 and some gastropods. 



Following the direction of the dip to the north side of Princess Marie Bay we find it again, 

 though seemingly somewhat abrupter, in the limestone beds of Norman Lockyer Island. A 

 fauna with Halysites sp., Zaphrentis sp., Orthisina sp., Rhynchonella sp., Leperditia sp., lUsenus 

 sp., etc., assigns this limestone to Lower Silurian. It is again found with its fauna at the base 

 of Cape Harrison; in this case with a thick superincumbent bed of marly sandstone, quartz 

 sandstone, and finally extensive limestone conglomerate. 



