276 MONROE AND TELLER 



A 1. This consists of the thin white seams, whose relations 

 are not definitely known. 



B 2. The upper four feet of the quarry rock, corresponding 

 with A 3. 



B 1. The lower twenty-one feet of the quarry rock, includ- 

 ing the very hard six-foot layer and several softer and less fossil- 

 iferous ones. This corresponds with A 2. 



Very likely subdivision B 1, at the cement quarry, could be 

 still further subdivided, the exceedingly hard layer at the top 

 being especially worthy of a place by itself. It is sufficient, 

 however, at present to say that this layer probably carries all the 

 fossils of the layers below it except the plants — which come from 

 further down — most of those above, and in addition a large 

 number of fossils peculiar to itself. Among the latter are most 

 of the fishes, most of the cephalopods, a few brachiopods and 

 many pelecypods. 



In the following table an attempt has been made to bring 

 together the fossils of the several subdivisions for purposes of 

 comparison. The lists are not exhaustive. Even at the cement 

 quarry, which has been the most thoroughly examined, new 

 species are occasionally found. The faunas of the shale and 

 " soapstone " are less perfectly known, owing to the limited 

 opportunity afforded for their study. Yet the formation has 

 already furnished in the neighborhood of two hundred species, 

 a remarkably rich collection from so limited a territory. 



The determinations of species are in some cases provisional. 

 The specimens of Chonetes and Spirifer have been submitted to 

 Professor R. P. Whitfield and Mr. Charles Schuchert. The fish 

 remains have been identified by Dr. C. R. Eastman and the 

 crinoids by Mr. Stuart Weller. In other instances some of the 

 names may have to be changed. Some of the species are new 

 and have not yet received names. 



It will be noticed that some species which are mentioned in 

 the Geology of Wisconsin as coming from this formation are not 

 contained in this list. Among them are Chonetes coronatus 

 Conrad ; Productella spinidicosta Hall and Trematospira hirsnta 



