194 D. D. CAIRNES SECTION ALONG YUKON-ALASKA BOUNDARY 



Geological Survey, who has identified several horizons within the Upper 

 and Middle Cambrian.^® 



Of the Ordovician remains the graptolites were sent to Doctor Euede- 

 mann, and the other specimens were examined by Dr. E. M. Kindle and 

 Mr. Burling, both of the Canadian Geological Survey. Doctor Euede- 

 mann reports as follows: 



"While the specimens were not so excellently preserved that one would be 

 very positive in their determination, I am fairly sure that the three following 

 forms are present: 



Dicranogr. cf. ramosus (Hall). 



Retiograptus geinitizianus Hall. 



Diplogr. {foUaceus var.) inclsus Lapworth. 



"The Dicranogr. is only represented by broken fragments of branches. These 

 show, however, in one or two places, the strongly introverted thecie of the later 

 Decranograpti. The Rctiograptus shows a number of interesting structural 

 features as the straight and zigzag axes, and it would be hardly more than 

 varietally different from Hall's species. 



"The Diplograptus is rather poorly preserved. It resembles, in my opinion, 

 most the form formerly referred to as a var. of foliaceus, viz., D. foliaceus var. 

 ineisus. 



"From the aspect of this faunule, especially the RetiograpUis and the 

 branches of Dicranogr., I would place it in the Normanskill or a little younger. 

 In our fauna these two occur only in the Normanskill." 



Doctor Kindle refers the two small lots of these remains which he ex- 

 amined to the Upper Ordovician, and Mr. Burling places those which he 

 examined and which were associated with the graptolites to the Normans- 

 kill. 



Of the Silurian remains tlie Stromatoporoids were sent to Prof. W. A. 

 Parks, of Toronto University, and the remaining forms were examined by 

 Doctor Kindle. Professor Parks refers all the specimens to the Silurian, 

 and finds that ^dth one exception they all belong to the genus Chathro- 

 dictyon,.the exception belonging to the genus Labechia. The remainder 

 of the large collection of Silurian fossils examined by Doctor Kindle were 

 referred by him partly to the Middle and partly to the Late Silurian. 



Of the Devonian fossils collected in 1911, Doctor Kindle states : 



"The fauna suggests a Middle Devonian horizon and probably Includes beds 

 ranging in age from late Onondaga to Portage time. There appears to be no 

 doubt that this fauna is identical with the Devonian fauna, which was found 

 by Kindle" in the Salmontrout limestone on Porcupine River." 



^ Detailed descriptions of these fossils, as well as of all the other fossils collected by 

 the writer along the 141st meridian, will be published in his report on this work, which 

 is In course of preparation. 



^ E. M. Kindle: Geologic reconnaissance of the Porcupine Valley, Alaska. Bull. Geol. 

 Soc. Am., vol. 19, 1908, pp. 327-329. - 



