IOWA ACADEMY OF SCIENCES. 



83 



As a result, a number of different titles has often been 

 given to the same formation as it appears in different local- 

 ities, and synonomy has increased amazingly. 



In considering the nomenclature it has been the aim to pass 

 over technicalities, and to adhere to the original idea and 

 intent of the author, so far as possible, even when definitions 

 have not been expressed according to present standards. 

 Personal examinations of nearly all the original localities 

 have enabled interpretations to be made that cannot always 

 be gathered from the published descriptions. 



Most of the many names for the Kansas' beds, appearing in 

 the Kansas University Quarterly, were first used incidentally, 

 with no attempt at exact definition. They have no valid 

 grounds for recognition or notice, and were it not for the fact 

 that their authors have claimed priority in naming formations 

 they would not be noted herein. They are, however, given for 

 what they are worth. 



The most satisfactory classification of the terranes com- 

 prising what has been generally called the coal measures of 

 the region appears to be as follows : 



The questions of synonomy are numerous and complex. All 

 important names involved in determining priority of usage 

 are believed to be included in the subjoined list. Their equiv- 

 alents as now known are enumerated in each case. 



NOMINAL HISTORY OF THE TERRANES RECOGNIZED. 



As use of the names adopted for the general section here 

 given may not be fully gathered from the synonomic list 

 appended it may not be out of place to give a brief account of 

 the nominal history of each. 



