3i6 The Auicrican Geologist. November, 1902 
the state. The Laramie was known to outcrop in eastern 
Wyoming but until recently no exposures have been noted on 
the Nebraska side of the state line. 
In a recent investigation of some phases of the Tertiary, in 
the Goshen Hole district of southeastern Wyoming, the writer 
traced the greenish-brown sands of the Laramie down the 
valley of Horse creek, the principal drainage of ( ioshen Hole, 
to a point near the state line, four miles above the mouth of 
Horse creek. Here the Laramie passes underneath the 
Chadron clays. About three miles southeast of its disappear- 
ance on Horse creek the Laramie again outcrops as small 
spurs of concretionary sandstone, extending up tlirough the 
bright colored Chadron clays which floor the Kiowa valley. 
These spurs occur at intervals along the east side of the state 
line for a distance of three miles. (Area shown on map.) 
The Laramie doubtless extends, as an underlying formation, 
some distance into Nebraska, but no other exposures known 
to the writer occur in the state. At the close of the Cretac- 
eous period there is evidence of some lapse of time during 
which surface erosion took place, for the overlying Chadron 
formation was deposited on a very uneven Cretaceous sur- 
face. 
The Laramie, in this locality, consists of, dull greenish- 
brown partly cemented sands and sandstone. The sandstone 
usually occurs in large concretions which have been locally 
lithified to a higher degree of hardness and somewhat dark- 
ened in color. These concretions vary in size from a few 
inches tO' 5 or 6 feet, the larger ones predominating. In 
form they are spherical, sometimes elongated, and lenticu- 
lar. In the exposures along Horse creek the concretions oc- 
cur in layers, interbedded with soft greenish-brown sand, 
but in this immediate locality only the large brown concre- 
tions, lying on the summits and slopes of the small spurs, can 
be seen. This material bears a close resemblance to the Fox 
Hills formation. 
