PLEISTOCENE GEOLOGY OF MOOERS QUADRANGLE 



5 



part, these deposits are glacial drift, either very much as left 

 by the retreating ice sheet, in the uplands above GOO feet, or, 

 below that level, more or less rearranged by wave and current 

 action on the bottom of temporary ice-barred lakes or at yet lower 

 levels by the sea. The strictly glacial deposits are also the most 

 recent of the glacial period and are presumably to be classed as 

 of the Wisconsin ice epoch and as pertaining to the later portion 

 of that time. 



WISCONSIN EPOCH 



The drift of this epoch forms the surficial deposits in the 

 southwestern part of the quadrangle and is almost everywhere 

 present in an unmodified form above the 600 foot level, though, 

 in consequence of processes which will be described later, much 

 modification of the drift has taken place at levels from near 900 

 feet downward. 



The glacial origin of this material is shown by numerous glacial 

 striae on the rock surfaces and by the direction in which it has 

 been transported, as well as by the occurrence of characteristic 

 recessional moraines. 



Glacial striation 



/ 



The direction and grouping of the glacial striae on this area, 

 indicating the direction in which the ice moved across it, are. 

 shown on the accompanying map by arrows for particular local- 

 ities at which the striae may be seen and by the pattern employed 

 on the map for the ice-laid drift over the areas occupied by this 

 material. 2 It will be noted that along the western border of the 

 area the ice moved in a southwesterly direction, and that along 

 the southern border it moved in a southerly direction. 



The accompanying table of observed striae includes those noted 

 in the field seasons of 1902-3. 



Table of glacial striae 



s. 61° w. Covey hill, Can. ; in road gutter on top of hill 



s. 46° w. Mooers; in public road, 3.1 miles n. of Irona railroad crossing 

 s. 36° w. 1 Mooers; s. bank of Big Chazy near camp meeting grounds 

 above Mooers 



s. 56° w. Altona; on sandstone ledges in woods s. of railroad, 2y± miles 



w. of Irona, possibly off map 

 s. 56° w. Altona; on old military road, % mile e. of western edge of map 

 s. 46° w. Mooers ; on road, % mile w. of Big Chazy at Wood Falls 



1 Locality farther east than others in this part of the table, where the ice 

 moved more southerly. 

 •This latter plan has not been carried out. 



