MARCELLUS LIMESTONES OF LANCASTER 147 



Loxonema sp. • rr 



Ooleolus tenuicinctus (?) Hall rr 



Opthoeeras exile Hall r 



O. marcellense Yanuxem r 



Phacops pana (Green) rr 



Primitiopsis punetulifera Hall r 



III 14 inches. This bed is a mass of confluent concretions 

 whose surfaces often show cracks filled with consolidated mud. 

 The concretions are of compact, rather light gray limestone, 

 which is harder and breaks more irregularly than that of bed II. 

 Irregular masses of crystallized calotte, probably filling cavities 

 left by dissolved shells, are common, and there are also small 

 masses of sphalerite and ehalcopyrite. Fossils are abundant, 

 well preserved, and indicate fairly robust individuals of each 

 species. 



The following fossils were found in this bed: 



Schizobolus concentricus (Yanuxem) rr 



Chonetes mucronatus Hall c 



C. scitulus Hall rr 



Strophalosia truncata (Hall) r 



Liorhynchus limitare (Yanuxem) c 



Spirifer (Martinia) subumbona Hull rr 



Ambocoelia nana Grahau r 



Nucleospira concinna Hall rr 



Meristella barrisi Hall rr 



Leptodesma marcellense Hall rr 



Pleurotomaria itys Hall rr 



Onychochilus (?) nitidulus (?) Glarlw r 



Loxonema sp. r 



Ooleolus tenuicinctus (?) Hall c 



Orthoceras exile Hall c 



Phacops rana (Green) c 



Primitiopsis punetulifera Hall rr 



IV 10 inches. The character of this bed is similar to that of 

 the preceding except that the large flattened concretions which 



