22 



16. A. H. WORTHEN; F. B. MEEK and. 



Contributions to the Palaeontology of Illinois and other 

 Western States. In Proc. Acad. Nat. Sci. Phila. Vol. X, 

 2d ser. pp. 251-275, 1866. 



17. A. H. WORTHEN; F. B. MEEK and. 



Descriptions of Palaeozoic fossils from the Silurian, Devo- 

 nian and Carboniferous Rocks of Illinois and other Wes- 

 tern States. In Proc. Chicago Acad. Sci. pp. 11-23, 1866. 



18. Geological Survey of Illinois, A. H. WORTHEN, Director, 



Vol. I, Geology, pp. i-xvi and 1-504, plates I-VIII (dia- 

 grams and maps). Imp. 8vo. Chicago, 1866. 



CONTENTS. 



PAGES. 



Letter to the Hon. Richard J. Oglesby i-vii 



Introduction ix-xvi 



CHAPTER I. 



Physical Features, General Principles and Surface Geology, 

 A. H. WORTHEN 1-39 



CHAPTER II. 



Stratigraphical Geology, Tertiary Deposits and Coal Meas- 

 ures, A. H. WORTHEN 40-76 



CHAPTER III. 

 Sub-Carboniferous Limestone Series, A. H. WORTHEN 77-118 



CHAPTER IV. 

 Devonian and Silurian Systems, A. H. WORTHEN 119-152 



CHAPTER V. 

 Geology of the Lead Region, PROF. J. D. WHITNEY 153-207 



CHAPTER VI. 

 Report on the Coal Fields of Illinois, LEO LESQUEREUX.. 208-237 



