358 GEOLOGY OF EASTERN WISCONSIN. 



onstrated that the coarse, open-textured Racine limestone graduates 

 horizontally into a precisely similar compact rock, and am therefore 

 inclined to consider the weight of evidence as favoring the conclu- 

 sion that such is the case here. In this view, the flags and thicker 

 even- bedded rock, on either side of the Fox river above Waukesha, 

 would be regarded as belonging to the Racine beds, being the strati- 

 graphical equivalents of the coarse-grained Racine layers. The only 

 undoubted members of the Waukesha beds are, then, the cherty flags 

 near the college and at the kiln. 



Farther up the stream, in Sec. 31, Menomonee, similar cherty flags 

 make their appearance, and they also occur in the drift at intermediate 

 points. 



At Pewaukee, the upper strata consist of a white, fine-grained, but 

 porous crystalline dolomite, having a conchoidal fracture. In this 

 portion occur the crinoids Caryocrinus ornatus, Eucalyptocrinus 

 craqsus, E. coslatus, E., n. sp., and the trilobites, Illmnus loxus and 

 /. pterocephalus, n. sp., in association with several Orthoceratites and 

 other fossils, thus manifesting a noticeable affinity to the Racine 

 fauna. 



The lower layers at this point are more argillaceous and silicious, 

 and of more irregular texture, with patches of cherty material. Ha- 

 lysites, Favosites and Pentamerus occur in these beds. In one por- 

 tion of Mr. Pel ton's quarry a layer is almost entirely composed of 

 a large Pentamerus oblongus, imbedded in white dolomitic material, 

 forming a rather heavy bedded rock of uneven texture. It lies near 

 the base of the quarry, but from its situation and the undulating na- 

 ture of the strata, its relation to the impure layers above mentioned 

 are not apparent. It is quite possible that, as suggested by Prof. 

 Whitfield on paleontological evidence, the upper portion belongs to 

 the Racine, and the lower to the Waukesha horizon. The list of fos- 

 sils, collected at this ponit, is as follows: Stromatopora concentrica, 

 Favosites favosus, Astrocerium venustum, Holy sites catenulatus, Za- 

 phrentis, Omphyma, Caryocrinus ornatus, Eucalyptocrinus crassus, 

 E. ccelatus, E., n. sp., Streptorhynchus subplanum, Strophomena 

 rhomboidalis, Spirifera nobilis, Meristina Maria, Atrypa reticularis, 

 Pentamerus oolongus^ P. ventricosus, Orthoceras annulabum, 0. 

 alienum, O. medulare, 0. crebescens, Oyroceras Hercules, Gomphoc- 

 eras nautilus, n. sp., Illcenus loxus, and /. pterocephalus, n. sp. 



An interesting feature of this locality is a mound of rock lying a 

 short distance west of the main quarries which rises ten or twelve 

 feet above its base, and has a diameter of only a few rods. It con- 

 sists of very irregular beds, coalescing promiscuously with each other 



