C. D. Walcott — Position of the Olenellus Fauna. 379 



fossils in the beds just above the conglomerate. They were 

 first found about 1,500 feet north of the brook, in a railway 

 cut, in some irregular masses of impure arenaceous limestone 

 resting on the conglomerate, and subsequently in red and green 

 shales resting on the conglomerate. In the reddish argillaceous 

 shale a large fine species of Olenellus was found that may be 

 referred to the sub-genus Mesonacis. It is allied to 0. {M) 

 asaphoides, and I propose to call it Olenellus {Mesonacis) 

 Broggeri* 



Associated with 0. {M.) Broggeri, in the red and green 

 shales and in an impure siliceous limestone, are the following 

 species : Ooolella Atlantica, n. sp., Hyolithellus mica^s Billings, 

 Hyolithellus f , n. sp., Hyolithes princeps Billings, H. impar 

 Ford, H. quadricostatus S. and Foerste, and one new species of 

 Hyolithes, Gasteropod, n. gen., n. sp., Scenella reticulata Billings, 

 Stenotheca rugosa, var. acuta-costa, n. var., Stenotheca rugosa, 

 var., erecta, n. var., Stenotheca rugosa, var. lewis., n. var., Steno- 

 theca rugosa, var. paupera Billings, Platyceras primcevum 

 Billings, Microdiscus Helena, n. sp., M. speciosus Ford, Micro- 

 discus sp. ?, Olenellus Broggeri Walcott, Avalonia Manuel- 

 ensis, n. gen., n. sp., Ptychoparia Morrisi, n. sp., Agraulos {S.) 

 strenuus Billings, Agraulos {S.) strenuus, var. nasutus, n. var., 

 Agraidos, n. sp., Solenoplextra bombifrons Matthew, Soleno- 

 pleura, n. sp. 



This fauna is essentially the same as that of the limestones 

 of the Topsail Head and Brigus sections, and proves conclu- 

 sively that the Olenellus fauna is subjacent to the Paradoxides 

 fauna. 



Mr. Murray in his report for 1868, placed on lithologic evi- 

 dence the Topsail Head limestone above the conglomerate of 

 Manuel's Brook, and the limestone of Brigus Head beneath the 

 conglomerate, in the generalized section published in the report 

 for 1870.f 



Mr. Matthew, in studying the collections sent to him by the 

 Geological Survey of Newfoundland, placed the fossils of the 

 Topsail Head and Brigus limestones beneath the Paradoxides 

 horizon on Manuel's Brook,;j; thus following the stratigraphic 

 arrangement of Mr. Murray. Subsequently he changed his 

 views and placed the Topsail Head and Brigus faunas in the 

 Paradoxides zone of the Manuel's Brook section.§ 



The stratigraphic section on Manuel's Brook, as measured 

 by me in August, 1888, is as follows : 



* The specific name is given in recognition of the excellent work of Brogger on 

 the Cambrian faunas of Sweden, and of the work of the Swedish geologists in 

 first clearly proving the true order of succession of the Cambrian faunas in Europe, 

 and suggesting that the same order of succession probably prevailed in America. 



f Report Geol. Survey, Newfoundland, 1870, Reprint of 1881, p. 238. 



% Canadian Record Sci., vol. ii, 1886, p. 256. 



§ Canadian Record Sci., vol. hi, 1888, p. 74. 



