HAMILTON GROUP. 



161 



The third locality is in the road from Hamilton to 

 Smyrna, where the two kinds of rock are seen, as well 

 as the common fossils of Hamilton and of the shale of 

 Handsome creek, the latter above the former. 



The fourth point of exposition is at the creek and 

 quarry west of North New-Berlin, which do not differ 

 from those near Sherburne, but the rock is coarser and 

 harder. At this quarry, the plant figured in wood-cut 40 

 was obtained. It is also found in other localities in this 

 group, but the specimens or individuals are but few at 

 each. The surface is smooth, with branches at irregular 

 distances. Plants with similar external structure occur 

 in the Catskill group under the coal of Pennsylvania, 

 along the Susquehannah below Wilksbarre. 



In Onondaga county are many places for the examina- 

 tion of the group, such as Buhr's falls on the edge of the 

 town of Cazenovia, not far from the village of Delphi. 

 The water falls sixty-four feet in height, the shale pro- 

 jecting at the falls like a huge buttress, which divides the 

 water, and adds to the beauty of the falls. The shale is 

 not of a fine kind, nor does it resist the action of the 

 water. Fossils are very numerous at the falls. 



Prati's falls. These are to the northeast of the village 

 of Pompey, on a branch of Limestone creek. The water 

 falls over a few feet of the hard calcareous coarse shale, 

 which abounds in the Flabella avicula, etc., and descends 

 into a gulf of over one hundred feet in depth, excavated in 

 the softer shale under the harder kind, in which fossils 

 are numerous. 

 A favorable locality for observing the succession of shales and harder rocks and their fossils, 

 from the base to the upper rock of Pratt's falls, is from the turnpike north, to Pompey village. 

 The first rock seen in ascending the hill going south, is similar to the low bluff north of 

 Levana, and contains the same fossils : next above it is what appears to be an orthis, which is 

 flattened and deformed ; then at a higher level are mineral and fossil products, not unlike 

 those of Skaneateles ; and again at the last rise before ascending to the village, is a quarry of 

 hard sandstone layers, with Flabella avicula. Erect avicula, Rugous cypricardite, etc., and 

 some very round or ball-like accretions about three inches in diameter. 



Another locality is Tinker's falls, on the edge of Cortland county, in the town of Fabius. 

 The water falls over the Tully limestone, exposing a thickness of about fifty feet of shale, 

 containing numerous fossils. For a few feet below the limestone, the shale is highly colored 

 Geol. 3d Dist. 21 



