FOSSILS OF THE HARDING SANDSTONE. L59 



Summary. 



., ., Species 



( >i in r<i. Species. ■ , .-,- , 

 ' identified. 



Brachiopoda I 1 1 (?) 



Lamellibranchiata 4 1- '■'> 



< rasteropoda 3 3 



( tephalopoda - - 1 



< Irustacea l 1 1 



Total 11 l'.» 6 



Recurrent above 9 1 1 



Limited to 2 18 5 



The presence of forms apparently identical with Lingula attenuata, 

 Modiolopsis trentonensis, Cypricardites ventricosa, C. rotundata, Orthoceras 

 multicameratum, and Leperditia fabulites leads to the conclusion that the 

 Trenton fauna is represented, and (from the known range of those species 

 in the New York section) that the fauna is lower Trenton or that of the 

 Black River and Birdseye limestones. This is further sustained by the 

 occurrence of the Trenton fauna higher up in the section. 



Only one species (Orthoceras multicameratum) is known to range upward 

 into the limestone, although it is probable that some of the species of 

 Lamellibranchs may be found to be identical in the two formations. 



Fremont Li tinstone — The fauna of the base of the limestone, number 3 

 of the section, extends through some earthy and semicrystalline layers 

 ranging from 4 to 10 feet above the upper bed of sandstone. It is large 

 and varied, and contains the following genera and species, as determined 

 in the preliminary study of the fauna: 



PROTOZOA. 



Stromatopora, sp. undet. Receptaculites, sp. undet. 



Receptaculites oweni, Hall. 



ACTINOZOA. 



Streptelasma, sp. undet. Phyllopora, sp. undet. 



Zaphrentis, sp. undet. * Columnaria alveolata, Goldfuss. 



* Halysites catenulatus, Linn. Favosites, sp. undet. 



Monticulipora, sp.? Heliolites, sp.? 



ECHINOZOA. 



Echinosphaerites, n. sp. Glyptocrinus, sp. undet. 



BRACHIOPODA. 



Strophomena alternata, Conrad. Orihis tricenaria, Conrad. 



Streptorhynchus JUitextum, Hall. " sp. undet. 



