606 A. W. GRABAU LOWER ORDOVICIC FORMATIONS 



Leptwna convcxa. 



Platystrophia dorsata His. 



Caryocystitcs granatum Gyllenli. 



Echinosphwritcs aurantium Gyllenh. 



Monticulipora petropolitana rand. 

 Orthoceras limestone (restricted). 



Ancistroceras limestone 5 m. 



Illcenus crassicauda Walil. 



Nileus armadillo Dalm. 



Asaphus rusticus Tqt. 

 Chiron limestone 5 m. 



Nileus armadillo Dalm. 



Illwnus chiron Holm. 



A saphus tccticaudatus. 



Asaphus brachyrachis Remele. 



A. densistris Tqt. 



Megalaspis formosa Tqt. 



Endoceras bellemnitiforme Ho'm. 

 Platyurus limestone 13 m. 



Asaphus platyurus Ang. 



Endoceras bellemnitiforme Hollii. 

 Gigas limestone 12 m. 



Megalaspis gigas. 

 Asaphns limestone S m. 



Asaphus expansus Wahl. 



A. vicarius Tqt. 



Megalaspis polyphemus var. tornquisti Schmidt. 



Illwnus csmarlci Schloth. 



Nileus armadillo Dalm. 



Orthis callactis Dalm. 



Orthisina ascendens Panel. 



Lycophoria micella Dalm. 



Bucania planorbiformis (Linns.) 



Salpingostoma cristatum (Linns.) 



Lytospira angelini Lindst. 



Vaginoceras vaginatum ( Schloth. ) 



Hiatus — disconformit y. 

 Megalaspis limestone. 



Limbata limestone 3. m.+ 



Megalaspis limbata Boeck. 



Niobe Iwviceps Dalm. 



Nileus armadillo Dalm. 

 Planilimbata limestone 3 . m.+ 



Megalaspis planilimbata Ang. 

 Ceratopyge limestone. 



Limestone . 14-0 . 16 m. 



Obolus fragments. 



Lycophoria Iwvis Stolley. 



Eorthis christians. 



