MARCELLUS LIMESTONES AND THEIR FAUNAS 119 



in actual elevation than at Jani^sville and Manlius, a result of 

 the low monocline traversing this region.^ 



About 3 miles west of Marcellus on the road to Mottville, 

 town of Skaneateles, the Agoniatite limestone is very near the 

 surface, but makes few if any well defined outcrops. Although 

 the actual interval between the Onondaga and Agoniatite lime- 

 sto'nes is not afforded by any of the Onondaga county sections 

 here observed we estimate it to be not far from* 20 feet. 



Cayuga county 

 One mile south of the tillage of Union Springs, and on the eaet 

 side of the road leadinig to Levanna, is an abandoned quarry 

 known as '' Wood's old quarry". It is situated in thie summit 

 Off a flat-topi>ed anticline, the strippinge extending pretty well 

 down the sides. The cap rock in the quarry wall is the Agonia- 

 tite limestone, 22 to 24 inches thick and in its usual condition, 

 very hard when fresh and dark, almost black in color, varying 

 much in texture and purity and crumbling under the weather. 

 It also contains a good deal of pj^rite, which gives old blockis a 

 rust}' color. For these reasons it is of little use to the quarrymen 

 and i® stripped to reach the Onondaga limestone beneath. At the 

 south end of this a slight thickness of black shales is seen above 

 the limestone. Below, the succession to the Onondaga lime- 

 stone is as follows: black shales with thin slabs of impure Lime- 

 stone, 3 feet; black shales and thin impure limestones in about 

 equal propiortion, 8 feet.; impure limestone, 1 foot, 6 inches, with 

 a shaly parting separating it from another layer of like character, 

 1 foot, underlain by 5 inches of soft black shale which rests on 

 the Onondaga (35 to 40 feet thick) a total for the intei'val of 

 about 14 feet. The argillaceous and impure limestones constitut- 

 ing the basal part-s of these Marcellus strata are largely devoid 

 of fossils, except Styliolina and plant spores, and the Agon- 

 iatite limestone itself is less abundant in its large cephalopods 

 than in more eastern outcrops. 



1 Prin. J. D. Wilson read a brief account of the stratigraphy and fauna of this limestone in 

 OnondaRa county before the Onondaga academy of science, Mar. 25, 1901, and has liindly allowed me 

 to make reference to the facts ylven in tiie above paragraph. 



