36 ILLINOIS STATE GEOLOGICAL SURVEY CIRCULAR 326 



Ulrich, E. O., and Bassler, R. S., 1904, A revision of the Paleozoic Bryozoa . 

 Pt. II— Trepostomata: Smith. Misc. Coll., v. 47, no. 1470, p. 15-55, 

 pis. 6-14. 



Weiss, M. P., 1957, Upper middle Ordovician stratigraphy of Fillmore County, 

 Minnesota: Geol . Soc. America Bull . , v. 68, p. 1027-1062, 5 pis. 



Wilson, A. E., 1921, The range of certain lower Ordovician faunas of the Ottawa 

 Valley with descriptions of some new species: Geol. Survey Canada Bull. 33, 

 Geol. Ser. 40, p. 19-57, 4 pis. 



Wilson, A. E., and Mather, K. F., 1916, Synopsis of the common fossils of the 

 Kingston area, in Baker, M. B., The geology of Kingston and vicinity: 

 Ontario Bur. Mines, v. 25, pt . 3, p. 45-66, 3 pis. 



Wilson, C. W., Jr., 1949, Pre-Chattanooga stratigraphy in central Tennessee: 

 Tennessee Div. Geol. Bull. 56, 407 p., 28 pis. 



Illinois State Geological Survey Circular 326 

 36 p., 4 text figs., 7 pis., 1962 



Printed by Authority of State of Illinois, Ch. 127, IRS, Par. 58.25 



