342 The American Geologist. December, i904. 
Fayler run, a tributary of Big run, on the S. AI. Oyler 
farm, about one-half mile west of Lithopolis, shows part of the 
Bedford and Sunbury shales and the Berea sandstone. The 
farm is on the road leading southwest from Lithopolis to the 
county line road and the exposures are to the northwest of the 
road and house. The section is a short one; but the run cuts 
through the entire thickness of the Berea sandstone as is shown 
below: 
feet of sandstone and shale succeeding the Waverly black slate [Sunbury 
shale] should be "designated as "the Buena Vista "section." At the time 
of the preparation of my paper on the Sunbury shale oi Ohio I had overlooked 
the Buena \ista section so proposed by Dr. Orton in the text of the Pike 
county leport and at that time I thought he had definitely anplied the name 
Buena A'ista sandstone onhi to the "City ledge" or what was considered its 
equivalent and hence I used the name in that sense (See Jovr. Geo/., Vol. X., 
1902, pp. L'88-2b^). Prof. C. L. Ilerrick in 1801 in his Portsmouth section 
gave the "Flags of Bueua Vista" with a thickness of 25 feet (Bull. Geol, 
^oc. Amcr.. Vol. II, p. 40). 
Since the stratigraphic term Buena Vista was used by Dr. Orton with at 
least two values, it is necessary to make a selection and its definite applica- 
tion in the Buena Vista section of the Pike county report to the fifty feet 
of shale and sandstone overlying the Waverly black slate C Sunbury shale) 
is the one which has been adopted. This will designate the lower portion of 
the Cuyahoga formation which in at least central and southern Ohio con- 
tains valuable layers of building and construction stone and may very ap- 
propriately be regarded as forming a lithologic division which is designated 
the Burna Visfa iiiciiihcr of the Cuyahoga formation. 
In southern Ohio the upper part of the member contains a variable num- 
ber of even bedded sandstones which are extensively quarried and to this zone 
apparently proiessor I^ocke applied the term "beautiful quarry" on account 
of "the perfect parallelism, and. in many instances the uniformity of the 
thickness of the sti-ata" {Second .\nwial Rrpi. ficol. Surr. Ohio. 1839, p. 
264 1. In the Ohio valley the top of this zone of even bedded quarry stone 
is apparently a definite and well marked stratigraphic horizon above which 
are thicker beds of shale with sandstone which is not valuable for quarry- 
ing. This contact is aamirably shown in the quarry of Mr. John Wright about 
2% miles up Carey run from the river road after crossing the Scioto valley 
west of Portsmouth, and is shown in Fig. 4, where Mr. Wilkinson is point- 
ing to the top of the Buena Vista member. 
Su''ceeding the quarry stone is a zone of blue to olive shale three feet or 
more in thickness, then a zone of shale and sandstone varying from 2-|- to 
3-H feet in thickness, both of which are clearly shown in Pig. 4, above which 
is a conspicuous ai-gillaceous shale zone about 5 feet in thickness. The lith- 
ologic similarity of this part of the section was found to remain quite con- 
stant in the various quarries and outcrops studied in the hills for several 
miles below Portsmouth. The top of the Berea sandstone and the Sunbury 
shale are nicely shown in Stony run, several miles below Portsmouth. About 
three-fourths of a mile up the run, a bank and the James Amlin quarry gave 
the thickness from the top of the Sunbury shale to the top of the quarry 
stone as 48% feet. This thickness of 48V2 feet for the Buena Vista 
member is in close agreement with Dr. Orton's original statement of 
fifty feet. Professor Andrews gave the thickness of what is regarded 
by the writer to represent the Buena Vista member as 75% feet (See 
his "Section of Waverly rocks from the Great Black Slate to the Sub- 
Carboniferous Limestone, as seen on the Ohio river," on "Maps showing 
the Lower Coal Measures" in Gcol. Siirv. Ohio, pt. II Rrpt. Prog. Sec. Dist. 
[in lStl9], 1870.) : but in this part of the section is the statement that a 
sandstone and shale interval of 29 1.^ feet was not measured and it is 
thought the taickness of this interval was over estimated. 
At Lithopolis it is more dirficult to accurately measure the thickness of 
the Buena Vista member than at the locality cited below I'ortsmoufh : but 
at the former locality Nos. 5 to 11 inclusive of the section are referred to 
the Buena Vista with an approximate thickness of 49 y^ feet. A recent 
measurement of this member by Mr. George F. Lamb gave 51 feet 11 inches. 
Succeeding the even bedded quarry stone at the top of the Buena Vista at 
Lithopolis is a conspicuous shale zone capped by a sandstone which is in 
striking agreement with the section below Portsmouth. 
C. S. Prosser. 
