Rules and Misrules in Classijication. — Marcou. 49 
cient number" (Lor. cit.. p. 669). As "the results presented 
are therefore merely tentative," the two geological maps ac- 
companying the report do not sustain the classification of 
strata, with 1,800 feet of Calciferous sandrock, containing a 
fauna of more than one hundred species, placed between the 
Potsdam and the Chazy fc>rmation by Messrs. Brainerd and 
Seely. 
Geology of Shoreham (Vermont). 
During 1862 I visited, in compan}^ with my friend, the late 
John B. Perry, the village of Shoreham (Vermont) and found 
there a repetition of the same group of lenticular or islet 
masses of magnesian limestone, included in slates, as at Phil- 
lipsburgh, and also the same fauna with Bathyrus, Mdclurea, 
Lifuife.^, etc. Messrs. Brainerd and Seely have published in 
1890 a geological map of East Shoreham, with two sections 
(" The Calciferous Form atio-n in the Champlain Valley," in 
Bulletin Amer. Museum Nat. 1/isf.^ vol. iii, No. 1, pp. 1-23, 
New York), which fails to show the slates inclosing the mag- 
nesian limestone as lenticular or islet masses, and presents 
above the Phillipsburgh group (called by them Calciferous), 
in concordance of stratification, first the Chazy limestone, then 
the Trenton and above the Mica slates. Those three impor- 
tant groups of the Champlain system, so well developed at 
Chazy village and its environs, are here ''rudimentary," ac- 
cording to those two authors, and no description, no list of 
fossils found in those three groups are given; so it is impos- 
sible to control in any way the determination of the age of 
those strata. As to the Potsdam sandstone at Shoreham, no 
fossils are given by the authors, and the stratigraphic posi- 
tion assigned to it below the Phillipsburgh group (Calciferous 
of Messrs. Brainerd and Seely) will require careful observa- 
tions, as regards inclination of strata, dips, as well as fossils, 
if an}"^ can be found. As a conclusion, the classification of 
strata at Shoreham is made against all rules, and is simply an 
attempt by Messrs. Brainerd and Seely to suppress the Upper 
Taconic and refer it to the Champlain system. 
[To be eontinned.] 
