ORDOVICIAN FOSSILS 55 



Books for further study 



Several works particularly useful in identifying Ordovician fossils are listed in the 

 "References cited" at the end of this book. Bassler's (1915) Index lists all Ordovician and 

 Silurian species known to that date; it is useful in locating descriptions and figures, especially 

 of the rarer forms. Special attention should be called to the illustrations in Bucher (1945) 

 and Cumings (1908). Ulrich (1895) has fine drawings of the pelecypods and Meek (1873) of 

 many kinds of Ordovician fossils. 



