Clarke — Oneonta, Ithaca and Portage Groups. 



73 



Preble village, on the west side of the valley. These beds lie about fifty feet 

 above the valley road. 



At the base are greenish gray compact shales, somewhat arenaceous, con- 

 taining Buchiola speciosa, Tomoceras uniangulare, Ohonetes scitula, Ch. lepida, 

 and Oladochonus, Overlying are barren greenish sands. Seventy-five feet 

 above, on the roadside, are greenish shales without fossils, fifteen feet. On 

 the east side of tins valley, at the hamlet called Baltimore, is an exposure 

 along the road to Truxton. This is thirty feet high and consists of fissile 

 black and greenish shales devoid of fossils. Above these, at an interval of 

 forty feet, are greenish shaly sandstones, also without fossils. This outcrop 

 lies below that first described, and at about the same level as the upper beds 

 mentioned. 



Three-quarters of a mile due north of the village, at an elevation of 200 

 feet on a hill at the west of this road, is a quarry from which the flagstones 

 on the village sidewalks were taken. Many of these stones are covered with 

 fucoidal markings and others are completely tilled with Cladochonus, 



Station XI. Marathon, Cortland county. A rock exposure begins two 

 miles north of Marathon station on the I)., L. and W. railroad, or one-fifth 

 mile north of the mile-post marked " Owego 83 in." This section is con- 

 tinued almost to Messengerville, where it is completed in the Virgil creek at 

 that place. 



The base of the outcrop is of soft, compact shales, very sparsely fossil- 

 iferous, overlaid by schistose green sandstone with abundant fossils in thin 

 layers. Above these layers are heavy bedded sandstones of highly concre- 

 tionary structure, like those observed at Solon. These weather out by 

 exfoliation into striking shapes and in their lower portion contain countless 

 numbers of Spwifer mesastrialis. At about the same horizon this fossil again 

 occurs in a thick calcareous sandstone which it rills to exclusion, and the 

 association is repeated on a lesser scale in the rocks above. These mesastrialis 

 layers are excellently shown along the Virgil creek. The fossils collected in 

 these layers are : 



Spirifer mesastrialis, large and typical (cc). 



Leptost/rophia m ucronata. 



Actinopteria JBoydi (c). 



Microdot) gregarius (c). 



Liopteria Gn-eiii (e). 



PalceoTbeilo feewnda. 



P. maxima (c). 



