Ze, University of Kansas Geological Survey. 
2. Coal, 24 inches. 
1. Gray sandstone? 
PALEONTOLOGY. 
The lower Dakota horizon is noted for the number and variety 
of its fossil plants, but with the exception of a few fresh water 
mollusks and the tracks of birds, no animal remains have been 
found. Among the plants the following genera are represented: 
Cessites (three species); Ficus (six species); Sassafras (four species); 
Diospyros (three species); Plantanus (? species); Leguminosites (one 
species); Jugians ( species); Protophyllum (? species); Lawrus (one 
Species); Aurus ( species); Rhanus ( species); Liriodendron (three 
species). Many pieces of fossil wood, and, in some instances the 
trunks of trees, have been found in the lower Benton. These un- 
doubtedly belonged to the upper Dakota horizon. 
In the upper Dakota group fossils have been found in three hori- 
zons. In the thin sandstone layers of the first shale bed the follow- 
ing fossils were found: Corbicula subtrigondis, Trigonarca salina- 
ensis, Yoldia microcodonta, Crassatellina oblonga, Arcopagella 
macrodonta, Tellina subscitula, Corbicula?, Protocardia salina- 
ensis, Cardium kansasense, Cyrena dakotensis, Margaritans nebras- 
khacenses, Mactra siuxensis, Tellina modesta, Tellina? besides several 
other forms not yet determined. 
In the saliferous shale horizon was found a bed of fossils of which 
the following have been determined: Leptosolen conradi, Pharella 
dakotensis, Pharella?, Cardiwm kansasensis, also a number of forms 
not yet determined. Altogether more than twenty five species 
have been found in the Upper Dakota. 
DAKOTA WATER-BEARING STRATA. 
There are two principal water sources in the Upper Dakota. 
Resting upon and beneath the saliferous shales are thin layers of 
sand or loosely cemented sand rock. It is through these layers 
that the so-called sheet water of the Dakota flows. Every where 
along the line of exposure of the Upper Dakota, from Washington 
county on the north to Ford county on the south, water flows from 
these sand beds, lying immediately above or below the shale hori- 
