318 ANNALS NEW YORK ACADEMY OF SCIENCES 



disappears. The Cuyahoga and Berea together represent the Kinder- 

 hook of the Burlington section (in which, if I understand him aright, 

 Professor Weller thinks that the upper 15 feet corresponds to the upper 

 part of the Chouteau, both stratigraphially and faunally, while the lower 

 part of the two sections corresponds stratigraphically but not faunally), 

 and they have the same relative position in both sections. If my hypoth- 

 esis of the equivalence of the Chouteau with the lower Burlington is 

 correct, then of course the Berea alone represents the entire Kinderhook 

 section at Burlington and presumably its correlates at Louisiana and at 

 Hamburg with their varying faunas. 



Professor Weller, as already described, recognizes two types of Kin- 

 derhook faunas, the northern one, the typical Kinderhook, not being 

 found at all southward in southern Missouri and Arkansas ; the other, 

 the Chouteau, occurring in Arkansas and Missouri and represented by 

 a few feet of rocks above the northern Kinderhook in the section at Bur- 

 lington. Professor Weller's interpretation of these facts is that the two 

 faunas were developed contemporaneously in disconnected basins, to the 

 more northern of which the southern fauna gained access near the close 

 of Kinderhook time. Tentativel} 7 , I would prefer to explain these rela- 

 tions by supposing that the southern Kinderhook was entirely later than 

 the northern and was represented in the Burlington section not by the 

 topmost Kinderhook alone, but by the lower Burlington also. However 

 that may be, the disappearance southward of the northern Kinderhook 

 fauna is somewhat suggestive of the southward thinning of the Bedford 

 and the Berea formations, as recently described by W. C. Morse and 

 A. F. Foerste. 19 



The careful stratigraphic work of these writers, combined with that of 

 Professor Prosser, indicates that the Bedford and Berea gradually thin 

 to a feather edge and presumably disappear as recognizable formations 

 in east-central Kentucky. To some extent, they also lose their distinct- 

 ive lithologic characters, so that Morse denominates as "Bedford-Berea" 

 the interval of shale and sandstone which they fill between the black 

 Ohio and Sunbury shales. The tracing by stratigraphy is corroborated 

 by the occurrence of more or less characteristic Bedford fossils at the base 

 of this interval in Kentucky, and Dr. Foerste himself very justly raises 

 the question whether the final appearance of these sediments, which con- 

 sist of shale alone, should not be referred solely to the Bedford forma- 

 tion, and the preceding occurrences in which the shales predominate 

 below and the sandstone above should not be divided into Bedford and 



10 Jonr. Geo!., vol. 17, p. 164 <it seq. 1909. 



