54 The Americam Geologist. January, 1905 
areas of Silurian rocks in the southeastern counties have yet to be 
delineated. The nomenclature of formations as it appears on the 
map and in recent Indiana reports is open to some criticism. The 
term Bedford is objectionable for reasons pointed out by the 
reviewer and others several years ago. At that time the term 
Salem limestone was suggested for the formation and was subse- 
quently sanctioned by the U. S. Geological Survey in preference to 
Bedford on substantially the grounds urged by the reviewer that 
Bedford is the name of a well known, well charcterized, and widely 
distributed formation in Ohio. Notwithstanding these patent facts, 
the Indiana survey has retained the term Bedford and introduced a 
still more objectionable duplication of names in the term "Huron 
formation" applied to rocks formerly known as Kaskaskia. This 
use of the term Huron is due to Messrs. Hopkins and Ashley. The 
Huron, again, is a name long used by Ohio and Michigan geologists 
for a Devonian formation much better characterized in every way 
than the Indiana formation in question. It was proposed by Win- 
chell in the First Biennial Repoil of the Michigan Geological Sur- 
vey in 1861. Only confusion can result from such duplication of 
names. 
In the discussion of the Ordovician stratigraphy the reviewer 
notes that Mr. Foerste employs several of the faunal designations 
of the sub-divisions of the Ordovician of Indiana, proposed by him 
in 1899, namely Dalmanella multisecta zone for the Utica, Rafines- 
quina alternata zone for the upper Lorraine and Dalmanella meeki 
zone [D. jugosa of Foerste) for the lower Richmond. These fau- 
nal designations are eminently proper and much more workable 
than the Bryozoan zones proposed by Nickles. The diflBculty of 
identifying the Trepostomata in the field will always render them 
of limited value to the stratigrapher. Any faunal designation of the 
divisions of the middle and upper Richmond at the present time is 
premature owing to the small amount of detailed study that has 
been bestowed upon this interesting series of rocks. The faunules 
of the Richmond seem to be of much more limited distribution than 
those of the X^tica and Lorraine. 
In the chapter on petroleum Mr. Blatchley again calls atten- 
tion to the many erroneous notions current among drillers and in- 
vestors in regard to the occurrence and supply of petroleum. 
A noteworthy contribution to Indiana paleontology is Dr. Kin- 
die's careful analysis of the faunas of the Niagara of northern In- 
diana. This paper is illustrated by excellent figures of the species 
considered. The author also describes the quaquaversal dips of the 
Niagara rocks of the northern area, and concludes that they have 
been produced in a way similar to the formation of mud lumps in 
the Mississippi delta, as recently described by Harris. 
E. R. C. 
