* 
i 
Association of American Geologists. 177 
the coal region of Dauphin and Lebanon counties, east of the 
Susquehanna. cli. , 
Thursday, 4 o’clock, P. Mi—The Association assembled at 
the rooms of Mr. Taylor, where that gentleman exhibited a highly 
interesting model in plaster of the Dauphin and Lebanon coal re- 
gion, embracing, altogether, an area of seven hundred and twenty 
square miles, showing the range of the mountain elevatio s, with 
their relative height and position; also their elevation above tide 
level ; the dip of the rocks, the position of the coal seams, and 
much other useful information. 
Mr. Taylor accompanied this exhibition with remarks explan- 
atory and statistical, in relation to this coal region, and made 
some observations on the importance of this mode of exhibiting 
the geological features of a country, expressing the hope that the 
day would come when models of this kind, representing the sev- 
eral states, and even the whole United States, shall be constructed. 
He also enlarged upon the propriety of following, as closely as 
possible, the actual conformation of the country in drawing sec- 
tions, and of adopting uniform modes of eas 
c., and the importance of an equal scale of extension and ele- 
vation as far as practicable in such sections.* — : 
Prof. H. D. Rogers followed with observations upon the 
Pennsylvania coal formations and the range of their underlying 
rocks, detailing what he conceived to be the cause of the inverted 
dip observable along the southern border of the Kittatiny series, 
ascribing it to a great force acting laterally, and folding and crush- 
ing the axes so as to produce this inverted dip by tossing the 
Strata many degrees beyond the perpendicular, and thus produ- 
cing the present apparent dip of the lower stratified or sedimentary 
rocks beneath the primary. : 
Adjourned to half past nine o’clock to-morrow morning. 
In the evening, the members of the Association had the pleasure, 
in common with a number of citizens, of listening toa very inter- 
esting and appropriate address from Prof. Hitchcock, embracing all 
the points at present most interesting to the American geologist.t 
Mr. Tayler’s article published entire, with a colored section, in the pres- 
—B 
* See 
ent number of this Journal.—B. 8. Jr. eM “ies 
t As this address is to be published entire by the Association, and it is intended 
to give an abstract of it in the next number of this Journal, no farther notice of it 
is inserted here.—B.S. Jr... 
Vol. x11, No. 1.—April-June, 1841. 23 
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ey. 
