;>42 /■'. M. Kindle — .Fauna I Succession in the 



in one bed of limestone. This is identified by E. O. Ulrich as 

 Eoorthist ml an mi Walcott. Mr. Ulrieh's remarks on this lot 

 of fossils are as follows : 



" Concerning No. 9, the stage of evolution attained by the 

 abundant orthoid brachiopod (Eoorthis? wimani Walcott) which 

 comprises the entire known fauna of the bed, is that known to 

 me only in post-Cambrian. Although Mr. Walcott has described 

 the species as a Cambrian fossil, I may say that the Swedish geolo- 

 gists, in whose country the typical E. wimani was found, do not 

 asrree with this assignment, but place it in the Ordovician. In 

 this country T have a similar — possibly identical — species in the 

 Beekmantown." 



Another fannule which is also of Ordovician age, but some- 

 what younger than J^o. 9 in the opinion of Mr. Ulrich, was 

 collected at the mouth of Lost River. The beds which fur- 

 nished this fauna include 15 feet of dark gray, thin-bedded 

 limestone near the top of the cliffs, 450 yards southeast of 

 the mouth of Lost River. This is essentially a trilobite fauna 

 and is listed as follows by Ulrich : 



Lot No. 6. 



Maclurea cf. emmonsi Billincrs. 

 Ceratopf/f/e? sp. undet. Pygidium only. 

 Encrimtrvs ? sp. undet. Pydigium only. 

 Hathyiirux? sp. undet. Glabella only. 

 Bathyurus ? sp. undet. 



Doctor C. D. Walcott made a preliminary examination of this 

 lot of fossils and communicated the following remarks concern- 

 ing it to the writer : 



"There are several species of trilobites in the collection indi- 

 cated by fragments. All of these indicate the Ceratopyge horizon 

 of the Swedish section. This horizon has been placed both in the 

 Upper Cambrian and the Lower Ordovician. The fauna may 

 also be compared with that of the upper portion of the Hamburgh 

 shale of the Eureka District horizon. (See Monographs 8 and 

 20, U. S. Geol. Survey.)"* 



At the writer's request these faunas were examined also by 

 Dr. C. D. Walcott and Mr. L. D. Burling. Dr. Walcott has 

 kindly furnished the following statement of his views concern- 

 ing the relative age of these faunules : f 



"Locality 8 is approximately the equivalent of the Upper Cam- 

 brian in Oklahoma and Texas and older than Locality 6, which 

 can be correlated with the Ceratopyge fauna of Scandinavia. 

 The latter fauna I have placed in the passage beds between the 

 Cambrian and the Ordovician. 



* Letter Jan. 9, 1909. + Letter of Jan. 18, 1911. 



