Prof. A.C. Leonard,

Grand Forks,

North Dakota



My dear Sir:



I received your letter of inquiry several days ago.  I was glad to hear from you and wish to thank you heartily for the copy of the Fourth Biennial Report of the North Dakota Geological Survey.



My report of the collecting expedition of 1905 etc. has been in the hands of the Directior of the Museum for some time.  I was waiting to see him about the matter before writing you but he is so busy getting ready to go to Europe and has so mucht o attend to that I may not bother him about the matter.  It probably will not be published before his return to America in June at least, but it will undoubtedly be in your hands long before you will publish your next report.



The Oligocene beds - the three principal divisions of the White River occur at Chalk or White Butte.  The lower - Titanotherium - beds are not positively identified by characteristic fossils but there is almost no doubt about them.  The Oreodon and overlying beds are fossiliferous.  On the western portion of the Butts I found no Oligocene but the lower beds.



These depsotis - the three horizons - occur also in the Little Bad Lands, southwest of Dickinson.  I believed, as you state in your report, that the upper beds on Heart River, where clay is obtained is Lower Oligocene,