526 E. 31. Kindle— Section at Cape Thompson, Alaska. 



Europe and Asia, but the evidence lias been more or less indi- 

 rect and general in character. The present faunas are espe- 

 cially interesting, because they seem to show to some extent a 

 mingling of the two faunas. The Mountain limestone element 

 is represented by the abundance of Lithostnotion, and other 

 features could probably be pointed out by one familiar with the 

 European faunas. The coral fauna of the Mountain limestone 

 is already known in Alaska, especially at Cape Lisburne, but 

 it has not there so far as known the admixture of Mississippian 

 types." 



In connection with the interesting resemblance of the Cape 

 Thompson fauna to the Spergen Hill fauna pointed out by Dr. 

 G-irty, reference may be made to the minute character of many 

 of the brachiopods occurring at horizon 14 D 1 . In this feature 

 the fauna strikingly resembles the depauperate Spergen Hill 

 fauna. The presence in the fauna of a small specimen of Pen- 

 tremites or a closely allied genus is also worthy of note in this 

 connection. Although extremely abundant in the Mississippi 

 valley, this blastoid has been recognized at but two localities in 

 the Rocky Mountains, and in both of these occurrences it is 

 associated with a fauna closely resembling the Spergen Hill 

 fauna. 



The higher beds of the Cape Thompson section are brought 

 in contact with the beds already described in the midst of a 

 zone of rather local but complicated folding and possibly of 

 faulting, which renders it impossible to give even an approxi- 

 mate estimate of their thickness as seen from the top of the 

 southeastern portion of the Cape Thompson cliffs ; but between 

 the second and the fourth deep ravines separating the high 

 ridges just southeast of the cape along the coast the exposures 

 are continuous for two miles, exposing a section of northerly 

 dipping beds in which the dip decreases from 35° to near 

 the middle of the synclinal. We find in the series of cliffs 

 which face the sea to the southeast of the second ravine below 

 Cape Thompson a section which p v asses without structural 

 complications from the fossiliferous Carboniferous limestones 

 to the top of the highest beds exposed in this vicinity. This 

 section is as follows ; 



Section 15, two miles southeast of Cape Thompson. 



e Soft black shales — 500 4- 



d Dark cherts and thin-bedded cherty limestones 



with some greenish bands 25' 



c Argillites with bands of black, green and dull red 



cherts 600' 



b Light gray limestone weathering buff, with some 

 bands of dark chert. Apparently barren of fos- 

 sils ' _ 2000' H 



a Light gray limestone similar to the above, but with 

 less chert and containing numerous fossils in 

 which corals are conspicuous 3000' + 



