Geology and Mineralogy. 63 
were probably transported 500 to 700 miles. The following gen- 
eral statement of Mr. Upham’s conclusion is from an early page o 
his report: 
“The terminal moraines, which form the principal subject of this 
report, show that the southern portion of the continental ice-sheet 
was divided into great lobes, each having a central current in the 
direction of its longer axis, with diverging currents bending from 
this and becoming perpendicular to its border. The red and 
blue till were the deposits of two such ice-lobes which overspread 
Minnesota from the northeast and northwest. During the most 
severe epoch of the ice age, before that in which the terminal 
till nor striw, This driftless area has a less average height than the 
vieinity of Paris; b . Davusrée, (Bull. Soc. Géol. de France, 
with one another, which exist at the various quarries in Tertiar; 
and Cretaceous strata about Paris. M. Daubrée points out the 
System in their courses, and the exceptional directions, and also 
their general parallelism to the reliefs of the region (the most 
valley of the Seine) illustrating the same by a map; an 
a notice 
* See also, for of these experiments, Dana’s Manual of Geology, 
edition of 1880, pages 801, 832. 
