180 Proceedings of Indiana Academy of Science. 
is an outcrop of mahogany clay which contains_a considerable quantity 
of Indianaite. Underlying the clay and separating it from a bed of 
shale is a thin layer of sandstone. A bed of sandstone having a thick- 
ness of twenty-five feet overlies the clay. The clay has a thickness of 
four feet at the outcrop, but pinches down to about half that in a dis- 
tance of six feet. The Indianaite occurs in hard, irregular fragments 
and also as white plastic streaks in the red-colored clay. On the same 
slope, below this outcrop, there are some greenish gray shales containing 
irregular masses of limestone surrounded by mahogany clay. This clay 
also contains some ffagments of the white Indianaite. 
On the same ridge, farther east on the north side, there is an outcrop 
of Indianaite six feet thick on the side of a sinkhole. On the south side 
of this ridge, in the southeast quarter of Section 28, Indianaite occurs 
under the sandstone, capping the top of the ridge, at about the same 
elevation as that on the north side. West of the road above mentioned, 
in Section 33, there is an outcrop of mahogany clay containing consider- 
able Indianaite. The clay occurs between, layers of sandstone of very 
fine grain. The overlying sandstone has a thickness of about thirty 
feet. The mahogany layer is irregular in thickness, pinching and swell- 
ing. Similar outcrops have been found in Section 27, on the southwest 
side of the ridge, and in Section 34, on the east side. 
Indian Creek Township.—tIndications of the presence of Indianaite 
have been found at several places along the ridge which forms the 
divide between Indian Creek and Clear Creek in this township. In 
Section 3 outcrops occur in the west half of the section. In Section 10 
outcrops of mahogany clay occur at several points, also in Sections 9 
and 17. In the northwest corner of Section 10, near the public road, 
there is an outcrop of a layer of mahogany clay having a thickness of 
about thirty inches in places, but thinning down to about half that in 
other places. White Indianaite occurs in the clay in small, irregular 
fragments, which are most abundant under the compact and unfrac- 
tured portions of the roof of sandstone. The underlying rock is shale, 
which passes into very sandy shale and lenses of sandstone just below 
the mahogany clay. The geological section exposed at this point is 
as follows: 
Feet. 
INoi8: ( CRop.)® sslvalle tse yswcaevpevatene eta te de petebene gees) scene eee 5 
None. Sandstone inetd serrated teas trier tt ene 5 
No:'6.. ‘Shale: *sandyaccc. te cciiere terete en een cree elo rn raat 6 
INo«:(53-- Sandstone iin. an. dees eo iauenete eaencreh rede nere ot ator ete 5 
No: 4: Shale’. aa s/s cath acto eat See ee beers ae 20 
Nox3. Sandstone, “thick layersis. mcs sinersseeston-n tegen 10 
No. 2. Mahogany clay and Indianaite................. 2% 
No. 1. (Bottom.) Shale, sandy toward top... -.... =. 12 
