NIAGARA LIMESTONE. 359 



and dipping irregukrly in all directions. The rock is, for the most 

 part, hard, compact, white, and, in some portions, cherty, and con- 

 tains a few Brachiopods. It evidently owes its origin to irregulari- 

 ties of deposition and not to upheaval. 



Johnson's quarry in the town of Genesee, presents a vertical 

 exposure of more than 25 feet, of a beautiful white, fine-grained 

 dolomite, in beds of 20 inches thickness and less, having an eastward 

 dip of one foot in sixty. Near the base a layer possesses the mottled 

 color and uneven texture above decribed. Fossils are rare in this 

 location. A few rods distant on the opposite side of the road, a 

 quarry displays very similar beds, but they are rather more por- 

 ous in general and abound in chert in certain layers which is 

 rare or absent at the former locality. They are also more fos- 

 silferous, though not abundantly so. The following species were 

 collected: Of Crinoids, Caryocrinus ornatus, Euoalyptoorinus 

 crassus, and E. caelatus; of Brachiopods, Orthis flabellula, Spirifera 

 plicatella, Atrypa reticularis, Hhynchonella Jndianensis; the Gas- 

 teropod, Platyostoma Niagarense; of Oephalopods, Orthoceras an- 

 nulatum, 0. alienum, 0. columnare, 0. medulare, 0. n. sp., Cyr- 

 toceras Orcas, Gyroceras Hercules, and the Trilobite, Illcenus ioxus; a 

 a fauna very closely resembling that of Pewaukee. 



In the rise of the hill, immediately to the east, flie typical, yellow, 

 coarse-grained Racine limestone appears, as it also does in the adja- 

 cent ridge on the south. It is probable tliat many of the prominent 

 hills in this region contain a core of Eacine limestone; though deeply 

 overlaid by the almost universally prevalent drift. 



Closely allied strata occur at Castleman's quarry, in the town of 

 East Troy, but no distinct fossils were found. The locality is widely 

 separated by deep drift from all other outcrops. 



Eeturning to the vicinity of the typical locality in "Waukesha coun- 

 ty, we find in Sec. 34, of the town of Lisbon, a formation that may be 

 said to be identical in character with the upper strata at Pewaukee. 

 To the east and northeast, in that and the adjoining town, are numer- 

 ous openings upon white, or light colored, fine-grained, even bedded 

 dolomite, with few or no fossils, which renders their place in the 

 series somewhat doubtful. 



As the horizon of the Waukesha beds is traced northward, it plun- 

 ges beneath the deep drift of the Kettle Eange, and on emerging be- 

 yond, the Byron beds and the Upper and Lower Coral beds are found 

 to occupy the space between the Eacine beds above and the Mayville 

 below. The cherty flags at Waukesha most closely resemble the up- 

 per portion of the Upper Coral beds, which occupy the same strati- 



