260 Field Columbian Museum — Geology, Vol. II. 



of Buffalo. Near the railway bridge the Encrinal limestone is ex- 

 posed with both the Moscow and Hamilton shales: All may also be 

 seen along the banks of the South Branch of Smokes Creek. Between 

 the railroad and the creek, large piles of weathered shale and blocks 

 of limestone are to be found in which fossils are abundant. Brachio- 

 pods and corals are the predominating fossils, and a fine series of well 

 preserved specimens was collected, but as most of them came from 

 the dump piles or talus, they are of little value in determining the 

 distribution of the species in the three horizons. 



After the identification of this material, the various species were 

 tabulated to see if the geological position of B5, B6, B7, and B9 

 in relation to the Encrinal limestone could be determined. Upon 

 comparison of these faunas with those of Moscow, B4, and B8, it 

 was not only found impossible to determine the position of the un- 

 known faunas, but also it was found that the Moscow fauna did not 

 bear the relation to those of B4 and B8, that might be expected. In 

 order to make the range of localities and faunas studied as complete 

 as possible, published lists of Hamilton fossils by various authors 

 from other localities were referred to and mention of any of the species 

 collected by the present writer noted. It was then found by a study of 

 the table, that while at different localities, the faunas could readily 

 be separated into "upper" and "lower," on correlating the localities, 

 these distinctions could not be maintained. Thus Aulopora serpens 

 occurs at Bethany in both the Moscow and Hamilton beds, while at 

 Thedford it is only reported from the Moscow, at Eighteen Mile 

 Creek only from the Hamilton, and at Cayuga Lake, from both. 

 The two species of Craspedophyllum are not reported below the Encri- 

 nal limestone at either of the other localities, but at Bethany C. 

 archiaci is very abundant all through the series, and C. subcaspitosum 

 is found only in the Hamilton. Favosites argus is reported only from 

 the Moscow at Cayuga Lake, and only from the Hamilton at Eight- 

 een Mile Creek, but at Bethany it is found in both layers. Strep- 

 telasma rectum is reported as extending through the series, and is so 

 found at Bethany, but the allied species S. ungula has been reported 

 only from the Moscow. At Bethany, however, it is found in both 

 the Moscow and Hamilton. The same may be said of Rhipidomella 

 vanuxemi and R. penelope. They are both found through the series 

 at Bethany, but while the former is so reported, the latter is reported 

 cnly ficm the Moscow. Stropheodonta concava is reported only from 

 above the Encrinal limestone at Thedford and Cayuga Lake, and 



