2i8 THOMAS H. CLARK 



The limestone is dark gray, almost black; and is crowded with 

 fossils wherever it outcrops. It is rarely crystalHne, but, upon 

 weathering, breaks down into a rubbly mass with little depend- 

 ence upon the inclosed fossils. Good opportunities for collecting 

 are therefore rather unusual, except on the weathered surfaces. 

 Whole specimens of brachiopods were not collected as such at the 

 outcrops, but were worked out in the laboratory. The corals, on 

 account of their much greater size, could be collected whole, the 

 limestone disintegrating around them. A day's search failed to 

 reveal any trilobites, although they have been reported before. 

 The brachiopods were almost exclusively of two species; what was 

 the relative abundance of the species collected by Logan and by 

 Ells is not stated in their reports. There is no doubt, however, 

 about the Onondaga age of the fauna. This will be shown by the 

 following list and descriptions of fossils recently collected by the 

 writer. 



COELENTERATA 



Favosites hasalticus (Goldfuss)^ 



One of the most abundant species present. The specimens are 

 in every way characteristic. Although Ami is reported as having 

 recognized F. gothlandicus from this locality, not a single specimen 

 in our collection can be placed in that species. Every individual 

 examined (a score or so) lacks spines within the corallites, but there 

 are many squamulae between the tabulae. The presence of spines 

 has often been considered an evidence of the Silurian age of a Favo- 

 sites, whereas squamulae are characteristic of Devonian species. 

 Diphyphyllum arundinaceum (Bilhngs)^ 



One of the most striking characteristics of our specimens is the 

 wide spacing of the strong simple tabulae. There are from six to 

 eight of these in each lo mm. The corallites seldom reach lo mm. 

 in diameter. More often they are less than 8 mm. The largest 

 specimen is 21 cm. from "root" to the outermost calyx. 



^L. M. Lambe, Geol. Surv. Can., Contr., to Paleon., Vol. IV (1899), Part I, p. 8. 

 Full lists of references are not given. Only those most easily accessible to students are 

 included. 



^ Lambe, ibid., Part II, p. 162; H. A. Nicholson, Paleontology of Ontario (1874), 

 P-34- 



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