90 



LOWER PENINSULA. 



quantities of kidney-ore nodules from the shale formation, which 

 are crowded with finely preserved fossils, identical with those 

 found in the exposures of Branch County, To enable a compari- 

 son with the fossils of other strata, I will enumerate the forms 

 collected from these nodules in the drift. The larger portion 

 of them are not specifically determined, because a great many of 

 them are undescribed forms, while in some cases I have used 

 specific names with the intention of indicating a similarity rather 

 than a full identity. 



Of corals a species of Zaphrentis and a Pyrgia are noticed. 

 Of Crinoids, heads of Platycrinus and numerous stems of other 

 forms occur. Bryozoa, as Fenestella, Polypora, Stictopora, and 

 Trematopora entirely compose certain ferruginous rock frag- 

 ments. Brachiopods are represented richly by Lingula, Discina, 

 Productus semireticulatus, Productus punctatus and two other small 

 species of Productus, Streptorhynchus crenistria, Spiriferina spi- 

 nosa, Spirifer setigerus, Spirifer Carteri, Syringothyris, Spirigera 

 lamellosa, Terebratula Eudora, Merlstella, Chonetes Illinoisensis, 

 entirely composing large boulders ; Rhynchonella, two species, 

 Strophomena rhomboidalis, and Orthis ; of Lamellibranches, five 

 species of Nuculoid shells, Myalina, Modiola, Cyrtodonta, Ortho- 

 nota, Cypricardinia, Conocardium, Lucina, Allorisma, Schizodus, 

 and several forms of Aviculopecten. Of Gasteropods, I distin- 

 guish four species of Platyceras, a Pleurotomaria, Loxonema, Mur- 

 chisonia, Bellerophon galericulatus, Bellerophon cyrtolites, and a 

 Tentaculites ; of Cephalopods, Trematodiscus digonus, various 

 forms of Orthoceras and Nautilus, Goniatites Oweni, Goniatites 

 Allei, fragments of Proetus or Phillipsia, numerous specimens of 

 Cypridina, and Fish remains. 



A large proportion of these species I can recognize among the 

 collections I made from similar iron geodes from localities in 

 Ohio, at Sciotoville, and in the strata of Bagdad, and other ex- 

 posures of the Cuyahoga shales, which latter, in lithological char- 

 acters, also bear considerable resemblance to our Michigan shale 

 formation. Prof. Winchell, who made a special study of these 

 Ohio fossils, correctly recognizes the Cuyahoga shales as equivalent 

 or analogous with the Marshall sandstones. I can not conceive, there- 

 fore, how he could overlook the similarity of the fauna of the shale 

 beds of Michigan to those, except on the assumption that he never 



