WABASH MOEAINE. 565 



Wayne moraine, and no terraces were found connecting with the Wabash 

 moraine. 



In the valley of Lake Fork, near Pleasant Home, there is a pitted 

 gravel plain with basins 3 to 4 feet deep, which has a sufficiently close 

 connection with the Wabash moraine to render it probable that it was 

 produced by the escape of glacial waters at the time the moraine was forming 

 The gravel plain does not, however, fit closely against the moraine, there 

 being the valley of a tributary of Lake Fork between the head of the gravel 

 plain and the outer border of the moraine. At its head the gravel plain 

 stands about 25 feet above the flood plain of Lake Fork. It is composed of 

 gravel of medium coarseness, few pebbles exceeding 2 inches in diameter. 

 The pebbles are well rounded and the gravel is almost free from earthy 

 material from near the top to the bottom, there being in places scarcely 

 enough earth on top to form a soil. A few miles below, this gravel plain 

 descends nearly to the level of the creek, and the stream is bordered by an 

 open marshy valley until the earlier moraines and their terraces set in. 



On a tributary of Lake Fork which leaves the Wabash moraine just 

 west of the Wayne-Ashland county line there is a terrace standing about 

 25 feet above the creek. It has its head at the moraine just north of the 

 Ashland and Pleasant Home road. No basins were observed at the head 

 of this terrace. 



In the valley of Jerome Creek, north and east of Ashland, there are 

 numerous knolls or island-like elevations. Thej^ are, perhaps, remnants 

 from erosion, though some appear to be glacial aggregations, such as those 

 in certain valleys of Mediila County, which are considered incidents to the 

 retreat of the ice sheet. One of these knolls, about 2 miles east of Ashland, 

 carries a basin near its crest, a feature which negatives the hypothesis that 

 the knoll is a product of erosion. The knolls are elongated in the direction 

 of the valley — northwest to southeast. They stand 15 to 25 feet above the 

 present flood plain. Some of them have a nucleus of cla)^ and a capping of 

 fine gravel ; others seem to be composed largely of gravel and sand. This 

 valley is characterized by such knolls throughout nearly its entire length, 

 the source of the creek being near the outer border of the Wabash moraine. 

 At the border of the moraine there are basins as well as knolls. The knolls 

 rise abruptly 10 to 25 feet above the basins and are rather gravelly. 

 Among the knolls are swales or marshy tracts which broaden out in places 



