MARCELLUS LIMESTONES OF LANCASTER 147 



Loxonema sp. rr 



Coleolus teniiicinctus (?) Hall rr 



Orthoceras exile Hall r 



O. marcel lense Vanuxem . r 



Phacops raDa (Green) rr 



Primitiopsis punctulifera 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 calcite, probably filling cavities 

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

 masses of sphalerite and chalcopyrite. Fossils are abundant, 

 well preserved, and indicate fairly robust individuals of each 

 species. 



The following fossils were found in this bed: 



Schizobolus concentricus (Vanuxem) rr 



Chonetes mucronatus Hall c 



C. scitulus Hall rr 



Strophalosia trunoata (Hall) r 



Liorhynchus limitare (Vanuxem) c 



Spirifer (Martinia) subumbona Hall rr 



Ambocoelia nana Grahau r 



Nucleospira concinna Hall rr 



Meristella barrisi Hall rr 



Leptodesma marcellense Hall rr 



Pleurotomaria itys Hall rr 



Onychochilus (?) nitidulus (?) Glarhe r 



Loxonema sp. r 



Coleolus tenuicinctus (?) Hall c 



Orthoceras exile Hall c 



Phacops rana (Green) c 



Primitiopsis punctulifera Hall rr 



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

 the preceding except that the large flattened concretions which 



