GLACIAL GRAVEL IN LIMESTONE, RIPON, WISCONSIN 59 
The gravel seam, No. 5, extends throughout the quarry, which 
is over 200 feet across. The dolomite layers above the seam are 
in no way unusual, but along the seam is considerable weathering 
so that the underlying rock is nearly everywhere disintegrated 
into a putty-like yellowish clay to a depth of an inch or two. 
It is this feature rather than the presence of gravel which makes 
this horizon so prominent, as is shown in Figure 2. The gravel 
op Cles UHI a ee ae antes Oop aie 2-3 feet [2% 
8. Gray, thin-bedded dolomite ................. Se 
7. Bluish thin-bedded dolomite................. 4. 
6. Grayish-blue dolomite...................... oO. 
5. Glacial sand and gravel maximum............. OE 
4. Hard gray rather thin-bedded dolomite....... Bo 
3. Blue, heavier bedded dolomite with fossils; 
SANG yet DASere rer ccimtecronnetan ae ietorepateecousraia tere 
2. Sandy buff dolomite, forming a parting. ...... °. 
1. Gray dolomite with layers of gray shale and 
sandstone. Irregular beds, the bedding in gen- 
eral dipping at low angles tc the east......... 4o. 
Motalwaboutiyas daseseraciotie cies viele sles evelevaiene 63 - 
Fic. 3.—Section of Kroll quarry, Ripon, Wis. 
and sand layer is best developed in the eastern part of the quarry. 
In thickness, the sand and gravel layer varies from a mere trace 
up to a maximum of about two inches (Fig. 4). The largest peb- 
bles are about an inch in diameter. Dolomite, granite, greenstone, 
and quartzite were distinguished. Minute cross-bedding is locally 
observed. 
In the sandstone pit to the east, larger gravel deposits are found 
filling gashes or irregular openings in the rock. Some of the 
Openings are as much as three feet across and of irregular shape. 
