DEPARTMENT 



OF THE MATHEMATICAL AND PHYSICAL SCIENCES. 



ON. THE EXTENT AND SIGNIFICANCE OF THE WIS- 

 CONSIN KETTLE MOEAINE. 



Br T. C. CHAMBERLIN. A. M.. 

 ' State Geologist, and Professor of Geology in Beloit College * 



At the meeting of the Academy, three 3'-ears since, I took the 

 liberty of occupying the attention of the members by the presen- 

 tation of some observations and conclusions in reference to a pe- 

 culiar series of drift hills and ridges in eastern Wisconsin, known 

 as the Kettle rang;e, and the views then advanced afterwards found 

 a place in my report on the geology of eastern Wisconsin.^ Sim- 

 ilar observations were subsequently made by Professor Roland 

 J). Irving, of the Wisconsin survej^, and his conclusions are in per- 

 fect agreement with my own.^ 



In neither case, however, was any attempt made to show the 

 full extent of the formation outside of the districts reported upon, or 

 to point out its theoretical significance, the chapters being intended 

 only as contributions to local geology, made under somewhat se- 

 vere limitations as to space. 



It is not now possible to map, or even safely conjecture, the 

 complete extent and limitations of the formation; but it is the 

 purpose of this article to add such trustworthy observations as 

 have since been made, and to gather such evidence as may justify 

 a provisional mapping of the range, where it has not been actually 



' 1 have taken advantage of the interval bstween the date of reading and the printing to 

 introduce neve matter. T. C. C. 

 » Geolosy of Wis., Vol. II, 1877 (revised edition 1878), pp. 203-215. 

 » Geology of Wis., Vol. II, 1877 (revised edition 1878), pp. 608-635. 



