the Upper Devonian of Iowa. 



359 



berry.' ' But there is another consideration that seems 

 to be even more important, and that is the way in which 

 Calvin's terminology was evolved. The Iowa Survey's 

 process was^ this ; It took a named formation, added to 

 that formation another (which has no connection with 

 it), and applied an entirely new formation name. It 

 then divided the formation derived by this operation 

 into two sub-stages. To one of these it gave a name that 

 is fitting and suitable — the Owen. For the other it took 



Columnar Sections ofthe Hackber~ry Stage 



iv _--- 



VIII 



A ce^ 



tfa-t' 



,sts 



Z o«« 



Zone 



VI 



20 



m v 4i 



is 



LOCALITIES 



VI- Mason City Dreiin 



I-HacKbefry G>©i/e Ti'le Tit 



jN-RocKfoT-d VJI- North western States 



Ill-Bird Hill , ,*"»•»* Co - 



n, * „..v n VM-Ueal, Complete Sec 



IV- Owens Qroue tl0t , ^ VeveX , F ecL ih 



V-MasonCity Bric/tATile Co. lo^a.- ^ 



- 



the name originally proposed for the entire formation; 

 cut it down on one side to cover less than half of that 

 which it was originally meant to cover; stretched it on 

 the other to include an unrelated formation that it was 

 never intended to include, and thus produced the Hack- 

 berry Sub-stage. Errors in thickness, statements that 

 formations that are rich in fossils were unfossiliferous, 

 and similar points I do not take into consideration. 

 They will serve to offset errors in the original descrip- 

 tion by Webster. 



Now that I have again removed the "forty feet of blue, 

 non-fossiliferous shales" — or have tried to do so, — I deal 



