FEB 5 ' 19T7 
The Ohio fJ\ Naturalist, 
PUBLISHED BY 
The Biological Club of the Ohio State University. 
LIBRAS; 
NEW YO 
botanic, 
Qarewel 
Volume XII. JANUARY, 1912. 
No. 3. 
TABLE OF CONTENTS 
Foerste— The Arnheim Formation within the Areas Traversed by the Cincinnati 
Geanticline 429 
Schaffner— New and Rare Plants of Ohio 457 
Metcalf— Meetings of the Biological Club 458 
THE ARNHEIM FORMATION WITHIN THE AREAS 
TRAVERSED BY THE CINCINNATI GEANTICLINE. 
By Aug. F. Foerste. 
CONTENTS. 
1. Subdivisions of the Arnheim 429 
2. Eastern Kentucky, from Maysville to Stanford 431 
3. Central Kentucky, from Stanford to Lebanon 435 
4. Western Kentucky, from Nelson to Trimble Counties 437 
5. Indiana 439 
6. Ohio 440 
7. Nodular top of Arnheim in Ohio 443 
8. Arnheim includes first advent of Richmond fauna 445 
9. Adair County, with outcrops in Marion and Casey Counties, 
Kentucky 445 
10. Western Tennessee 446 
11. Southern Kentucky, along the Cumberland River 447 
12. Globular bryozoans in Casey and Lincoln Counties, Kentucky . . 447 
13. Diastrophic movements during the deposition of the Arnheim ... 448 
14. Origin of the Arnheim fauna 449 
1. Subdivisions of the Arnheim. 
Along the eastern line of outcrop of the Ordovician formations 
in Kentucky, and in the immediately adjacent parts of Ohio, the 
lower part of the Arnheim member of the Richmond is compara- 
tively unfossiliferous, while the upper part is abundantly supplied 
with fossils. The transition is sufficiently abrupt to be traced 
readily in the field. In fact, the line of separation between the 
lower, comparatively unfossiliferous division and the upper 
richly fossiliferous part of the Arnheim may be traced more 
readily, with greater exactness, and for a greater distance than any 
other horizon in the Richmond along its eastern line of outcrop. 
For this reason, the line of separation between the upper and lower 
Arnheim is more definitely known than any other horizon in the 
Richmond of eastern Kentucky, and it has been found convenient 
429 
