*3Q 



NEW YORK STATE MUSEUM 



beds and in Cook county the upper beds are described as consisting of a 

 light gray fossiliferous limestone weathering to a yellow or buff color, of a 

 decidedly concretionary structure, and showing stratification very imper- 

 fectly. The rock is in many places stained with bitumen, and contains cavi- 

 ties filled with the substance in a semifluid condition. This rock seems to 

 agree lithologically with the Guelph beds of Wisconsin. 



Indiana. No indications of the presence of the Guelph beds in this 

 state have been found in the Indiana geological reports. In the 21st 

 report the following series of beds is given by Foerste : (1) Clinton; (2) 

 Basal Niagara limestone ; (3) Lower Osgood clay ; (4) Osgood limestone ; 

 (5) Upper Osgood clay; (6) Laurel limestone; (7) Waldron shale. Above 

 the Waldron shale follows the Louisville limestone, with an average thick- 

 ness of 40-55 feet. In regard to this it is stated [p. 233] that immediately 

 below the overlying Corniferous limestone there are found in it, in Clark 

 county, Pentamerus mysius var. crassicosta, Strombodes 

 pentagonus, Favosites favosus, Halysitescatenulatus. 

 There is herein no Guelph representation in the Louisville limestone. 

 In the 2 2d annual report, Foerste [p. 214] records that fossils are rare 

 in this limestone, and that most of them have been found just above the 

 Waldron shale ; that, further, the lowest fossils which could with certainty 

 be identified with species from Devonic horizons have usually occurred 

 2 5 or 30 feet above the Waldron shale. It is added that the opinion, 

 frequently expressed, that all the rocks overlying the Waldron shale are 

 Devonic and that the top of the Waldron shale marks the top of the 

 Siluric, it is believed will not stand investigation. The Catalogue of the 

 Fossils of Indiana, furnished by Mr E. M. Kindle, contains no Guelph 

 species. 



In the geologic description of northern Indiana by I. A. Price in the 

 24th annual report, it is also stated that the Waldron shale does not form 

 the top of the upper Siluric. At a number of places some 10 or 12 feet 

 of intervening limestone is to be found between the shale and the base of 

 the Devonic. This is called the Hartsville bed and is considered as corre- 



