FOSSILS OF THE BURLINGTON 63 



chell brought to light so many interesting forms which charac- 

 terized the beds immediately below the Burlington limestone. 

 At Burlington, too, the Burlington and Kinderhook formations 

 are sharply contrasted lithologically ; and faunally the two 

 horizons are equally well defined. 



Passing southward 100 miles to Louisiana, Missouri, the 

 same lithological and faunal features are found as at Burlington. 

 These characters are shown for 50 miles along the great river 

 in this vicinity. 



In the lower bed of the Burlington limestone is found the 

 typical and well-marked fauna of this formation. Many of the 

 species, however, have a somewhat greater vertical range than 

 at the Iowa localities. Among the most characteristic species 

 of leading types of the life of the period may be mentioned : 



Orophocrinus stelliformis, Owen & Shumard. 

 Cryptoblastus melo, Owen & Shumard. 

 Granatocrinus projectus, Meek & Worthen. 

 Rhodocrinus wachmuthi, Hall. 

 Rhodocrinus wortheni, Hall. 

 Agaricocrinua brevis, (Hall). 

 Dorycrinus unicornis, (Owen& Shumard). 

 Dorycrinus subaculeatus, ( Hall ). 

 Batocrinus seqiialis, ( Hall). 

 BatocriDus longirostris, ( Hali ). 

 Batocrinu3 elegans, ( Hall). 

 Actinocrinus proboscidialis, Hall. 

 Aetinocrinus tenuisculptus, McChesney. 

 Pbysetociinus ornatus, ( Hall ). 

 Steganocrinus sculptus. (Hall). 

 Steganocrinus araneolus, ( Meek & Worthen). 

 PJatycrinus americanus, Owen & Shumard. 

 Platycrinus burlingtonensis, Owen & Shumard. 

 Platycrinus discoideus, Owen & Shumard. 

 Platycrinus subspinosus, Hall. 



The fauna of this bed (about 11 feet in thickness) is pri- 

 marily a crinoidal one. The above mentioned forms are some 

 of the most important marking this limited horizon. Many 

 other crinoids, as well as brachiopods, corals and gasteropods, 

 are mingled; but they range upward into the other layers more 

 or less extensively. 



