~ the Geological Society o 
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i 
80 Notice of a Geological Model. 
Art. [X.—WNotice of a Model of the Western portion of the 
Schuylkill or Southern Coal-Field of Pennsylvania, in illus- 
tration of an Address to the Association of American Geolo- 
gists, on the most appropriate modes for representing Greologi- 
cal Phenomena; by Ricuarp C. Taytor, Member of the 
~ Amer. Phil. Soc.; Fellow of the Geol. Soc. of London, and. 
of other Societies in Europe and the United States. Read 
9th of April, 1841. 
On the 18th of June, a I had the honor of presenting to 
London, and of reading a concise de 
scription of two models and sections of part of the mineral basin 
of South Wales, in the vicinity of Pontypool. 
On the present occasion I take the liberty of exhibiting to the 
Association of American Geologists, at their second annual meet- 
ing, a model of the western half of the Schuylkill coal-field, in 
~ Pennsylvania. This is, in all Eine OG first geological 
model that has been constructed in the U; States; as was, 
believe, that of the Welsh mineral district, the earliest of its kind; 
_ and as such was received in the exhibition of the Society of Arts.* 
I have felt anxious, I may say ambitious, to introduce the first 
American geological model to this Association. It seems neces- 
sary to the occasion to make a few explanatory observations, and 
I desire especially to address some general remarks to this meet- 
ing, on the available methods of geological illustration. 
Before proceeding to the descriptive details of the present work, 
. the region which it represents, I would advert to the ex- 
‘eme applicability of the science of modelling to the purposes of 
geological elucidation. : 
During a somewhat active life, embracing thirty six years of 
al connected either with the superficial features of our 
zarth’s surface, in various climates, or with investigations of the 
positions of rock formations, the modes of representing the prin- 
cipal phenomena, and the different systems resorted to for prac- 
tical illustrations, have, of course, been long and frequently under 
deliberation. The result, it need scarcely be added, is an increas 
ing conviction of the vast superiority of that method which ad- 
ae P ro 
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* The gold Isis medal being awarded to the exhibitor in 1830. 
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