A SYNOPSIS OF THE TYPE SPECIMENS OF FOSSILS 

 FROM THE PALAEOZOIC FORMATIONS OF 



WISCONSIN. 



Edgar E. Teller. 



PART I 



The Palaeozoic formations of Wisconsin, as shown by the 

 known geological investigations of all of those epochs in the state 

 overlying the Archaean or Granitic period, are the Potsdam, 

 including the Lower Magnesian and the St. Peters sandstone 

 found in the south central and northwestern parts of the state, the 

 Trenton and the Galena in the southern part, the Lorraine, or, as 

 more commonly known in Wisconsin, the Cincinnati group of the 

 Hudson River formation in the eastern, all parts of the Lower 

 Silurian, the Niagara extending almost the entire length of the 

 eastern part of the state, a small exposure of the Guelph limestone 

 near Cedarburg and Grafton, a limited exposure of the Lower Hel- 

 derberg, also in the eastern part, the three formations belonging to 

 the Upper Silurian, and a small exposure of the Hamilton forma- 

 tion of the Devonian Age in the eastern part of the state lying 

 north of the City of Milwaukee. 



All of these formations may be said to be quite fossiliferous, 

 some parts exceedingly so, and all of them have furnished a large 

 number of genera and species to Hie investigators of such objects; 

 and considering the limited amount of palaeontological work that 

 has been done upon them a very fair number ?)" new genera and 

 species, and among which there yet remains grand opportunities 

 for future investigators. 



The purpose of this paper is to review the work that has been 

 done in the collecting and describing the type specimens of fos- 

 sils that have been described from these formations within this 



170 



