Clarke — The Naples Fauna. 



137 



THE ORGIN OF THE GONIATITINE ELEMENT OF THE NAPLES 



FAUNA. 



The data here brought forward to show the intense individuality of the 

 Naples fauna, in the New York series of geologic formations, will be greatly 

 fortified by a completer knowledge of its lamellibranchs and gasteropods. 

 Such remarks, therefore, as are here made upon the derivation of this fauna, 

 are for the present intended to have no wider application than to the element 

 which we have been considering. 



It has been observed in the earlier pages of this paper that no evidence 

 of the Intumescens-fauna has been recorded in this country outside of western 

 New York. Since that statement was put in type the writer has received a 

 copy of volume vii of the annual report of the Iowa Geological Survey (1897), 

 where, in a list of species contained in the upper Devonian Lime Creek shales 

 of Cerro Gordo county, is cited (p. 168) u (T<»ti<ttites sp." Upon application to 

 state geologist Professor Samuel Calvin, the author of the paper immediately 

 concerned, on the " Geology of Cerro Gordo county," the writer has been 

 permitted to examine the specimen referred to, which, it may be added, is 

 stated by Professor Calvin to be the only observed example. 



The fragment is but apart of a shell, but the outer whorl shows the septa 

 with perfect distinctness. It is a Manticoceras intumescens approaching very 

 closely the Pattersoni subtype. 



This fact loses none of its interest from the nature of the associated fossils. 

 The fauna with which it occurs was first noticed by Professor Hall in 1858 ;*. 

 and since then lists of the species have been given by Professor Calvin, the 

 most complete being that in the work above cited. There is a remarkable 

 agreement in the constitution of this Lime Creek fauna and the Devonian fauna 

 occurring at High Point, in the township of Naples, N. Y., this agreement 

 largely being in species which are not as yet known to occur in other horizons 

 or in intervening localities, f 



With reference to the character of its constituent fossils, this High Point 

 fauna has properly been looked upon as the horizon of Rhyncliotiella (Pug-nax) 

 pugrms and a representative of the Chemung brachiopod fauna of New York, 

 though several of its species, common to the Lime Creek fauna, have not else- 

 where been found in the later Chemung faunas. The position of the High 

 Point beds is 500-600 feet above the final recorded appearance of the Intu- 



•GeoloRy of Iowa, vol. 1, part 2. 



tSee Clarkk, Bull. No. 18, U. S. Qeol. Surv. pp. 78-76, 1885. 



