88 Unversity Geological Survey of Kansas 
Fauna.—See Doctor Beede’s chart, plate XLII. 
Pleasanton Shales.22 
The term Pleasanton shales was first introduced by Ha- 
worth in 1895. At that time it was applied to the entire mass 
of shales lying above the Pawnee limestones and what was 
then called the Erie limestone, the lower member of which is 
now known to be the Bethany Falls limestone. The inter- 
vening Altamont and Coffeyville limestones were not known 
at that time. Later, in volume I of this series, in his section 
west from Fort Scott Bennett? referred to the Altamont and 
Coffeyville limestones, but still they were not recognized as 
having any considerable lateral extent. Still later, in volume 
III, Haworth?‘ recognized the Altamont limestone as being 
prominent in the southern part of the state, but was of the 
opinion it did not extend much north of Fort Scott. He there- 
fore speaks of the Lower Pleasanton shales and the Upper 
Pleasanton shales for the southern part of the state, and de- 
scribed those two beds as coalescing into one north of Fort 
Scott. It is now known, however, that the Altamont and 
Coffeyville limestones are continuous entirely across the state, 
this knowledge having been acquired by field-work during the 
summer of 1905. It is desirable, therefore, to give individual 
names to each interbedded shale formation. Consequently - 
the name Pleasanton shales is reserved and here applied to the 
upper portion, which is by far the heavier and more prom- 
inent, and the names Bandera and Walnut are applied to the 
others, as already shown in previous pages. 
It should be noted that Professor Swallow, in his report for 
1866, gave no name for either of these shale-beds, and as best 
we can determine by a careful study of his report they corre- 
spond to the lower part of his Marais des Cygnes Coal Series, 
probably from his numbers 188 to 192, inclusive, but it- must 
be confessed we are somewhat in doubt on this subject. 
Thickness.—The Pleasanton shales as here described have a 
general thickness of 125 to 150 feet. Their greatest thickness 
is in the vicinity of Blue Mound, Boicourt and La Cygne, where 
they constitute the main mass of the high hills, which are 
capped with overlying limestones. 
Area.—The Pleasanton shales occupy a zone noted for its 
22. Haworth, Prof. E.: Kan. Uniy. Quart., vol. 111, p. 274. Lawrence, 1895. 
23. Bennett, Rev. John: Kan. Univ. Geol. Surv., vol. 1, pp. 94, 95. 1896. 
24. Haworth, Prof. E.: Univ. Geol. Surv. of Kan., vol. III, pp. 39-43. 
