NOTE ON OCCURRENCE OF INDIANAITE IN MONROE COUNTY, 
INDIANA. 
W. N. LoGAN, Indiana University. 
During field work in 1917 the writer’s attention was attracted to an 
outcrop of reddish colored clay containing fragments of a white clay 
near the public road in Section 3 of Indian Creek Township. A later 
examination of the white clay showed it to be Indianaite, a variety of 
halloysite. 
In the spring of 1918, Mr. Dick Hall located a number of outcrops 
of the same kind of clay in the township. One of these outcrops is on 
the public road near the John Koontz place in Section 10. The section 
exposed consists at the bottom of a shale containing sandy layers near 
the upper part, overlying this is a layer of mahogany-colored clay of a 
thickness of thirty inches, containing fragments of Indianaite, and above 
is a five-foot layer of sandstone. The Indianaite occurs under and in 
most cases immediately in contact with the sandstone. Where the sand- 
stone is compact and unfissured the Indianaite is more abundant. The 
thickness of the mahogany clay is variable, pinching and swelling. In 
some places it may have a thickness of four feet and pinch down to 
less than half that amount in less than ten feet. 
At one point in Section 28 of Van Buren Township, in a sandstone 
layer, there is a thin layer made up of the fragments of Indianaite. 
This occurrence shows that the Indianaite had been formed, eroded and 
redeposited. Below the sandstone there occurs a layer of mahogany 
clay which contains small fragments of Indianaite. The mahogany clay 
rests on a thin bed of sandstone, which in turn rests on a bed of greenish 
colored shales. In the shale there are irregular, lens-like masses of 
limestone. Where exposed at the surface these limestone masses are 
surrounded with mahogany clay in which fragments of the white Indi- 
anaite were found. 
Distribution.—In Van Buren Township, Indianaite has been found in 
Sections 27, 28, 33 and 34. The outcrops occur on the slopes of a ridge 
which rises about 900 feet above sea level and forms a part of the 
divide between Clear Creek on the east and Indian Creek on the south- 
west. On the road which connects West pike with the Rockport pike, 
passing through the center of Section 28 and intersecting the above- 
mentioned ridge, there are a number of outcrops of Indianaite. On the 
northern slope of the ridge, at the point where the road crosses it, there 
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