RANGE AND DISTRIBUTION OF RETICULARIA LAEVIS 191 



Eastward of Ithaca, R. laevis has not been found beyond the 

 valley of the Chenango River. The easternmost localities known in 

 the New York area are the McGrawville section 4 miles east of 

 Courtland, East Horner,^ and the Cowles Hill section at Greene.^ In 

 the region intervening between the Cayuga section and the Chenango 

 valley, R. laevis has been found at a number of localities during the 

 survey of the quadrangles in this district. Its occurrence in this area 

 has also been recorded by Clarke and Luther.^ East of Ithaca the 

 Ithaca brachiopod fauna extends upwards, filling the upper part of 

 the Nunda column, which was occupied by the Naples facies to the 

 westward before the Tiognioga River is reached. All of the occur- 

 rences of R. laevis in this region are associated with the Ithaca fauna. 

 The occurrence at Greene represents the highest horizon attained 

 by the species in this eastern region. It occurs here above the 

 Oneonta sandstone in what Clarke calls a "proemial Chemung 

 fauna,"'^ and "not less than 1,200 feet above its first appearance" ^ 

 at Ithaca, according to this author. In this section R. laevis occurs 

 with Leptostrophia mucronata, an Ithaca species, and no Chemung 

 fossils are reported as occurring with it, so that Clarke's conclusion 

 as to its post-Nunda age is based presumably upon stratigraphic 

 grounds. The discovery of R. laevis and Sp. disjunctus in association, 

 by the writer, as already noted, however, leaves no question as to the 

 fact that R. laevis appears in the New York section as late as the 

 lower part of the Chemung. 



In Pennsylvania R. laevis has been found at only two localities. 

 These are on the Susquehanna River, in sections studied by the 

 writer at Hollowing Run and Catawissa. In both of these sections 

 the species is found associated with the fauna of the Ithaca facies. 

 In the Catawissa section R. laevis occurs at two horizons. The lower 

 faunule in which it occurs contains : 



Cystodictya meeki (a) Nucula sp. (r) 



Cyrtina hamiltonensis (r) Palaeoneilo plana'(c) 



Spirifer mucronatus var. posterus (r) Leda diversa (r) 



Sanguinolites ( ?) sp. (r) Actinopteria perstrialis (a) 



1 Fifteenth Annual Report, New York State Geologist, 1895, p. 72. 



2 Ibid., pp. 37-39. 3 Bulletin No. 82, New York State Museum, p. 64. 



4 Sixteenth Annual Report, New York State Geologist, 1896, p. 36. 



5 Fifteenth Annual Report, New York State Geologist, 1895, p. 39. 



