1< s n The American Geologist. (September, 1884 
a formal close, li includes a survey and summary of the work from 
the beginning to the end. the fossils being all named in tabular arrange- 
ment and referred to their stratigraphic positions in the series. The 
si rata thai contain these fossils are composed of four main parts, viz: 
Feet. 
Basal series (Etcheminian) at Han ford brook, St. .Martins. 1.200 
Division 1 ( Acadian i at the Alms House. Simonds 650 
Division 2 (Johannian) at King's si pi a re, Carleton 1,000 
Division 3 (Bretonian) al Straighl shore, Portland 700 
Total thickness 3,550 
Of these the Etcheminian, winch is below the St. John proper and 
separated from it by some evidence of a plane of erosion, is perhaps the 
representative of the Olenellus horizon. From it, however, only a very 
sparse fauna has been obtained. The strictly primordial trilobites air 
confined to division 1. of the St. John group proper, in which bands e 
and d are characteristically a Paradoxides horizon. No species of Olen- 
ellus is listed. Division 2 is practically non-fossiliferouls, having afforded 
only tracks, burrows and trails. Division 'A, however, has in one of its 
bands near the lop. a Large number of graptolites which are thought to 
ally the beds of this division with the Lower Silurian (Ordovician) hor- 
izon (A merican Geologist, mi. pp. 193,340). With these are brachio- 
pods and a number of trilobites. the latter being Agnostus bisectus. and 
A. trisectus, Parabolina spinulosa. heres, and grandis, Parabolinella 
posthuma, Protopeltura acanthura var. tetracanthura, Peltura scarabe- 
oides. Cyclognathus rotundifrons, Leptoplastus latus and spinosus, 
Ctenopyge Bagillifera, acadica and pec ten, Sphserophthalmus alatus var. 
canadensis, anil Conocephalites contiguus, and two unknown species. It 
may be questioned whether this fauna should not be kepi within the 
Upper Cambrian, as that term is used by most American geologists, 
rather than extending the term Ordovician or Lower Silurian down- 
ward so as to cover it. The term Ordovician was devised to cover those 
beds which were in dispute between Sedgwick and Murchison, and the} 
were the Bala and Llandeilo. the American Hudson River and Trenton, 
and to these it would seem legitimate to confine the term. The above 
fauna is lower than the true Ordovician. and comes more nearly at the 
horizon of the St. Croix, or Upper Cambrian. N. n. vv. 
Contribution /<> tin- Knowledgi of tin Pregladal Drainagt of Oliio. By W. 
G. Tight. (Bulletin of the Scientific Laboratories of Den i son Univer- 
sity, vol. viii. pj). 35-62, with five plates, June, 1894.) In this article 
Prof. Tight has published I he results of some of his observations on I he 
glacial geology of the district near and around Granville and Newark. 
Ohio. It would not be easy to find a more complicated spot than the 
gorge of the Licking river between Newark and Zanesville; and the au- 
thor's explanation of the history of the changes that have produced this 
gorge, or rather these gorges, seems natural and necessary. He traces 
three distinct anil successive channels of the river Consequent on the 
conditions caused by the presence of the ice-shee1 and of the morainic 
matter left on the surface when the ice retreated. The ponding back 
