NO. 1192. 



TRENTON FAUNA OF BAFFIN LAND—SCHUCSEBT. 149 



Minnesotfi, and iiotMng younger than the Utica stage of the United 

 States. The thickness of these beds is not less than 900 feet and prob- 

 ably exceeds this. 



This summary is based on information known to the author, and, 

 while the evidence is meager, the essential geological age and the 

 sequence of the rocks of Baffin Land seem to be established. 



PALEONTOLOGY. 



HalVs collections. — The few fossils collected at Silliman's Fossil Mount 

 and brought to America by Mr. Hall were identified by E. P. Steveus^ 

 for the New York Lyceum of Natural History, as follows: 



Maclurea magna Leseuer [probably Maclurina manitobensis']. 



Endoceras proteiforme Hall? {^^Cameroceras proteiforme]. 



Orthoceras (badly worn specimens). 



Heliolites (new species). 



Heliolites (new species). 



Halysites catenulata. 



Eeceptaculites (new species) l=?B. oiveni of this paper]. 



There is apparently nothing in this list but what was again discov- 

 ered in 1897. Mr. Stevens writes that "the fossils, without doubt, are 

 all Lower 3ilurian," and on the basis of the Maclurea magna "would 

 place the limestone contaiuing it on the horizon of the Chazy limestone 

 of New York." However, it does not a])pear that this writer announced 

 any particular age beyond Lower Silurian for the rocks comprised in 

 Silliman's Fossil Mount.^ 



Another lot of fossils collected by Hall on his first expedition to 

 Frobisher Bay was given to Amherst College, and forms the basis of 

 Prof. B. K. Emerson's report " On the Geology of Frobisher Bay and 

 Field Bay." In this lot, there is apparently nothing from Silliman's 

 Fossil Mount, but Utica and Trenton fossils are present from localities 

 more to the eastward and from the north shore of Frobisher Bay. 

 These are : 



TRENTON SPECIES. 



["Gray argillaceous limestone." ?Cape Stevens.] 



Buthotrephis cfr. gracilis Hall. 

 Stictopora ramosa Hall? 

 Rhynchonella. 

 Tellinomya levata Hall. 

 Mnrchisonia gracilis? 

 Conularia trentonensis Hall. 



UTICA SPECIES. 



["Flinty bituminous limestone." ?Jones Cape.] 



Diplograptusdentatus{BroTigniiirt). 

 Lingula ciirta Conrad. 

 Endoceras proteiforme Hall. 

 Orthoceras laqueatum HalH 

 Triarthrus hecM Green. 

 Calymmene senaria Conrad. 



'Amer. .Journ. Sol., 2(1 ser., XXXV, 1863, pp. 293, 294, 



2 Prof. B. K. Emerson says: "We made inquiry, but can find no traces of this or 

 the other fossils reported upon in Mr. Stevens's article quoted." See " On the Geol- 

 ogy of Frobisher Bay and Field Bay." Appendix III to "Narrative of the Second 

 Arctic Expedition made by Charles F. Hall," edited by Prof. J. E. Nourse, Washing- 

 ton, 1879, p. 576. 



