To His Excellency, the Hon. Haeeison Ludington, 



Governor of Wisconsin. 



Sie: — It affords me great pleasure to submit the following contri- 

 bution toward the final report of the Geological Survey of Wisconsin, 

 begun in the year 1873, and still in progress. The manuscript for 

 the remaining volumes is in part prepared, but the completion of 

 certain portions is dependent upon field work now being prosecuted, 

 and must await its conclusion. An earnest effort will be made to 

 complete the series at as early a date as the proper execution of the 

 work will permit. 



Most respectfully, your obedient servant, 



T. C. CHAMBEELIN, 



Chief Geologist. 

 Beloit, August 8, iSyf. 



