238 ILLINOIS STATE ACADEMY OF SCIENCE 



Raflnesquina alternata (Emmons) (c) Richmond 

 Rhynchotrema capax (Conrad) (c) Richmond 

 Rhynchotrema perlamellosum (Whit.) (c) 

 Strophomena neglecta (James) (c) W. 

 Strophomena planumbona (Hall) (c) W. L. 

 Strophomena planodorsata Winchell and Schuchert (c) 

 Zygospira modesta Hall (c) Richmond 

 Pterinea demissa (Conrad) (c) Richmond 

 Cyclonema sp. (c) 



Calymene meeki Foerste (c) Richmond 

 Isotelus maximus Locke (c) 

 Synhomalonotus christyi (Hall) (c) W. 



In the above list of fossils there are ten species thai 

 are not known to occur in Indiana in rocks younger than 

 the Waynesville division of the Richmond, and all but 

 one of these are there restricted to this division. There 

 are no other species in this list that are confined to a 

 single division of the Richmond in Indiana. There can 

 be no doubt that they represent about the same time of 

 deposition as the Waynesville beds of Indiana, and that 

 the fauna corresponds with that of the Fernvale at Wil- 

 mington, above described. The species of trilobites, 

 Isotelus maximus and Synhomalonotus christyi, occur in 

 the lower more shaly strata, and are not found in the 

 uppermost limestone layers. 



A fauna similar to that occurring along Aux Sable 

 Creek is present in the Richmond strata near Oswego in 

 Kendall county, 15 miles farther north. A practically 

 complete section of these strata, from the contact at the 

 top with the Silurian limestone, is exposed along Fox 

 River between Oswego and Yorkville. The detailed sec- 

 tion is as follows: 



SECTION OF RICHMOND STRATA BETWEEN OSWEGO AND 



YORKVILLE 



Ft. In. 

 Silurian system, 



Limestone, yellowish-gray, partly dolomitlc in layers 2 



to 4 inches thick 2 4 



Ordovician system 



Richmond shale and limestone 



Shale, greenish, thin bedded, without fossils 3 



Limestone, subcrystalline, in uneven layers 7 to 10 



inches thick, with many fossils 6 



Limestone, bluish, shaly 2 



Shale, blue 3 



Limestone, bluish, slightly shaly, in layers 1 to 8 

 inches thick, with occasional shale partings 4 to 6 

 inches thick 4 



