92 The American Geologist. 
August. 1905 
thickness of somewhere from 30 to 45 feet (can not be well 
determined from the face of the bluff), and the Matfield 
formation has a thickness of about 70 feet. The Florence 
flint is about 20 or 25 feet thick and the Fort Riley lime- 
stone is about 40 feet. 
According to our figures the total thickness of the sec- 
tion in the hill at Garrison is 300 feet. One of the writers 
was informed that the bluff had been measured by transit 
and level and found to be 268 feet above the town. Our 
section includes the higher hills to the north of the flag 
pole, which, probably, were not included in the measure- 
ment just referred to. 
About a quarter of a mile west of the Garrison junc- 
tion Beede gives a section of fifteen feet of the base of the 
Wreford limestone.* A mile farther west he gives another 
section beginning somewhat above the Wreford limestone 
and continuing into the Fort Riley limestone. t Number 
1 of this section should read 25 feet instead of 20 feet, mak- 
ing the total thickness of the section 98 feet, divided as fol- 
lows : Matfield formation 51 feet, Florence flint 22+ feet, 
with 21 feet of the Fort Riley limestone exposed. 
This general survey gives an idea of the stratigraphy 
of the lower Permian and associated rocks north of the Kan- 
sas river. These rocks from Manhattan and Junction City 
southward to the Cottonwood river have been made fam- 
iliar to the geological public by Prosser and Hay and only 
some of the salient points will be mentioned to bring them 
clearly to the reader's mind. 
Central Province. — At Manhattan, Prosser gives the 
thickness of the Cotonwood limestone as five feet,* and at 
Alma five and one-half feet. West of Manhattan, along 
the Kansas river the higher formations appear. Prossert 
reviews the sections of Meek and Hayden, Swallow, and 
Hay. According to Meek and Hayden's estimate the Gar- 
rison formation had a thickness of 109 feet; according to 
Swallow the thickness is from 124 to 153 feet, while Prosser 
found it to be 122 feet. Meek and Hayden give the thick- 
ness of the Wreford limestone as 40 feet ; according to Swal- 
* Op. cit. p. 199. 
t Loe. cit. p. 201. 
* Bull. Geol. Soc. Amer., vi, pp. 33, 37. 
t Op. cit. p. 47 et seq. 
