1 86 The American Geologist. September, looi. 
quiet and rather deep water wherein they accumulated, the 
depth being apparently beyond that of wave activity. This 
limestone is therefore of great purity, since it consists wholly 
of the calcareous remains of organisms. The position of the 
limestone appears to be near the base of the middle Traverse 
limestone (stratum 2), but its characters are probably not 
traceable over a very large area. 
Loc. 5. About a mile north of this outcrop, at Sta. 15, is 
another outcrop of limestone along the west line of Sec. 35. 
Here the liniestone has again the coral-reef character, with 
Acervularia and Favosites predominating. This exposure be- 
longs near the base of the limestone series. Besides the fossils 
mentioned, Zaphrentis, fenestelloids, Atrypa reticularis and 
crinoid stems may be mentioned. 
Loc. 4. This is two-tenths of a mile north of the last local- 
ity, at Sta. 17a, along the east line of Sec. 27. The limestone 
here is similar to the preceding, and belongs to the same series. 
It contains numerous crinoid remains, and Stropheodonta is the 
commonest genus of brachiopods. 
B. The Lozi'cr Traverse SJiales and Limestones. 
Loe. 5. About a third of a mile further north, at Sta. 19, 
is an outcrop of impure but highly fossiliferous linjestone, which 
weathers to a yellowish-brown color, and leaves an earthy 
residuum. The reef corals are rare, but other types, such as 
Zaphrentis, Aulopora, and the like, are met with. Brachiopods 
are common and among these a robust variety of Atrypa retic- 
itlaris is the most abundant. Other commpn species are: 
Spirifer miicronatiis. Chonetes coronatus, Stropheodonta de- 
inissa. S. concava, and 5". erratica ( ?). 
From the thin bedded character of this rock, it might well 
be mistaken for a shale in the drill record. At any rate, this 
rock underlies the crystalline limestone, and with the beds next 
below it probably forms the nine-foot stratum of "shale" 
(stratum No. 3) in the Churchill well record. 
Loc. 6. Less than two-tenths of a mile to the north, at Sta. 
20, is an outcrop of black shale, highly bituminous, and char- 
acterized by the extreme abundance of a small species of 
Stropheodonta. This is a species closely related to 6^. plicata 
of the Iowa Hamilton. The plications are angular near the 
beak, but become rounded and less pronounced toward the 
