bas 3 
Association of American Geologists and Naturalists, 173 
_ As going to show the inclined position of the strata at the time 
when these impressions were made, Prof. W. B. Rogers called 
attention to a peculiarity in the form of many of these impres- 
sions, noticed by himself and Prof. H. D. Rogers in company 
with Prof. Hitchcock, during the last summer, and often remark- 
ed by Prof. Hiteheock on previous occasions. The feature refer- 
red to resembles the effect of a slight sliding of the foot in soft 
clay. It is seen in sone of the larger footsteps, both those which 
point upwards and downwards in reference to the present slope 
of the rocks, and is even more conspicuous where the animal has 
been. walking horizontally along the inclined surface, in which 
case there is a protuberance on the downhill side of each impres- 
sion, as if in virtue of the slope the pressure of the foot had ac- 
cumulated the soft clay in that direction. Adjourned to 
Thursday, 34 o'clock, P. M.—Prof. W. B. Rogers in the chair, 
A-communication from Prof. Chester Dewey on the polished 
rocks of Rochester, N. Y. 
Dr, Locke exhibited about eighty colored casts of the fossils 
found in the western rocks, with explanatory remarks, and upon 
the advantages to be derived to geological science from the dis- 
tribution of similar copies. 
| Mr.eJames Hail and Prof, H. D. Rogers offered some re- 
marks on observations made’ in connection with Dr. Locke on 
the same subject. ee oo: 
Dr. King expressed the opinion that the fossils exhibited by 
ore; some of them were actually from the stratum overlying that 
Oreys y 
Resolved, That the attention of the meeting be strictly confin- 
ed to the reading of papers, during the remainder of the present 
Session, ‘and that no discussion be allowed thereon. 
Mr. James Hall read a paper in connection with a section 
Which he exhibited, of the rocks extending from Cleveland, Ohio, 
southwesterly to the Mississippi. 
