NORTHERN AND SOUTHERN KINDERHOOK FAUNAS 633 



is present in central Missouri, but the beds containing it do not con- 

 stitute one continuous limestone formation. Instead, three distinct 

 formations are recognizable in Green County. The lowest of these 

 is a limestone identical in lithologic characters with the lower beds of 

 the Chouteau Limestone of Pettis County, and carries essentially 

 the same fauna. 1 Its thickness may be estimated at about 10 feet, 

 and it may be considered as the thinned edge of the Chouteau Lime- 

 stone lens. 2 The second member occupying the Kinderhook interval 

 in Green County has been called the Northview, 3 and corresponds 

 with Shepard's Hannibal Shale, except that the limestone at the base 

 is excluded as noted above. In its lithologic characters this formation 

 is essentially identical with the Hannibal Shale and Sandstone lying 

 above the Louisiana Limestone in northeastern Missouri, and the 

 faunas of the two formations are related. However, the Northview 

 and the Hannibal do not constitute one continuous formation, the 

 entire interval in central Missouri being occupied by the Chouteau 

 Limestone. The highest Kinderhook bed in Green County is the 

 Pierson Limestone. 4 



In northern Arkansas all the Kinderhook beds, so far as they have 

 been examined, are characterized by the faunas related to that of the 

 Chouteau Limestone. In southeastern Missouri, Kinderhook beds 

 are well exposed in the Mississippi River bluff near Sulphur Springs 

 and Kimmswick, and elsewhere in Jefferson and St. Louis Counties. 

 The most characteristic fauna in this region occurs in a red calcareous 

 shale. The fauna is peculiar in some respects, but its affinities are 

 with the Chouteau faunas of central and southwestern Missouri, and 

 not at all with the Louisiana-Chonopectus fauna; this fauna is 

 recognized as far north as southern Jersey County, Illinois. 



1 In an earlier paper ("Correlation of the Kinderhook Formations of South- 

 ■western Missouri," Journal of Geology, Vol. IX, pp. 130-48) this lowest bed of the 

 Kinderhook section in Green County was taken to be identical with Shepard's Sac 

 Limestone. This was an error, as further investigation has shown. The Sac Lime- 

 stone lies beneath this Kinderhook limestone, the Phelps Sandstone with its Ptyctodus 

 fauna being between. This lowest limestone of the Kinderhook interval was given but 

 little mention by Shepard in his Green County Report, being included in his Hannibal 

 Shales, On p. 87, he speaks of these lower harder beds being used for curbing, etc., 

 .and on p. 202 he mentions these beds as the Hannibal limestone. 



2 For the fauna of this bed see Journal of Geology, Vol. IX, pp. 136, 137. 



3 Weller, Journal of Geology, Vol. IX, p. 140. 4 Weller, loc. cit., p. 144. 



