408 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL, XXXIV. 
author’s time was devoted to collecting the echinoderm fauna of the 
area for Mr. Frank Springer, but, in tracing the various crinoid 
horizons, an exceptional opportunity was afforded to study the 
stratigraphy in detail. This collecting resulted in the addition of 
many new species to the already considerable crinoid fauna and in 
the discovery of material affording new data concerning the 
described forms. These crinoids are at present being studied by Mr. 
Springer, who expects to publish a special monograph upon them in 
the near future. Besides the study of the stratigraphy with Mr. 
Pate, the junior author paid particular attention to the collection of 
the other classes of fossils, so, by a combination of efforts, it is 
hoped to add something to the knowledge of the region. Practically 
all of the echinoderms found on these various trips are a part of the 
Springer collection, while all of the remaining specimens belong to 
the U. S. National Museum. | 
In 1847, Roemer visited this glade region and spent about five 
weeks collecting the fauna. The country was then very sparsely 
settled, and his efforts were, of necessity probably, confined to De- 
eatur County, in the vicinity of Dixon Spring and Brownsport Land- 
ing, where he could secure living accommodations. Practically all 
the species which in 1860 were described by him in * Die Silurische 
Fauna des Westlichen Tennessee ” were collected on the glades of the 
locality mentioned. Since Roemer’s species have been procured from 
the same sections and localities by subsequent collectors, there is 
now no doubt regarding their geologic position. Troost, Safford, 
Worthen, Wachsmuth, Rominger, and other paleontologists collected 
on the glades repeatedly, but, aside from the publication of a new 
species now and then, nothing further has been done upon the 
paleontology. 
The first account of the stratigraphy of these Silurian rocks was 
given by Professor Safford in 1861,° and later in his Geology of Ten- 
nessee, in 1869, where the Niagaran rocks are subdivided into two 
nearly equal portions, each about 100 feet thick, a lower or variegated 
bed and an upper or sponge-bearing bed. The general section pre- 
sented by Professor Safford, taken from the type locality at Clifton, 
is as follows: 
(2) Meniscus limestone. . 
(0) Sponge-bearing bed; gray, crinoidal, and argillaceous lime- 
stones, many of them glade-forming, highly fossiliferous, 
containing sparsely thin layers of chert_____-_____________ 90 feet. 
(a) Variegated bed; gray, red, and mottled limestones, inter- 
stratified; many layers argillaceous; Orthocerata abundant 
in its lower part. Clifton is located in part upon it_______ 96 feet. 
DMARD. WAKO CIE Tae IONIC M 186 feet. 
“Amer. Jour. Sci. (2), XXXI, pp. 206, 207. 
