G2 -PALEOZOIC PALEONTOLOGY. 
ously correlated by him with the “Ribbon limestone” at Rondout, 
New York, which is the Manlius or “Tentaculite” limestone lying 
above the Rondout waterline formation. This correlation of the 
Bossardville limestone was also adopted by White in his Pennsyl- 
vania report. As a matter of fact, the age of the Bossardville lime- 
stone: is very much greater than that of the Manlius limestone. at 
Rondout, although the two formations are somewhat similar in 
lithologic characters. ‘The Bossardville limestone itself is entirely 
barren of fossils, but it is followed by a series of beds which: are 
highly fossiliferous, containing a well-defined, Silurian fauna. 
DECKER FERRY FORMATION. 
In his report on Pike and Monroe counties, Pennsylvania, White* 
has described three formations succeeding the Bossardville limestone, 
which he designates by the name Decker Ferry, from the ferry of 
this name below Flatbrookville—the Decker Ferry shale, the Decker 
Ferry sandstone and the Decker Ferry limestone. The first two of 
these formations are closely allied, the so-called shale being an alter- 
nation of thin sandstone beds with thin beds which are more cal- 
eareous, rather than a true shale. These two formations of White 
will here be included in a single division, and will be called the Decker 
Ferry formation. The Decker Ferry limestone of White is quite 
distinct, both faunally and lithologically, from the Decker Ferry 
formation here recognized. 
-At Flatbrookville and north to Peter’s Valley this entire formation 
could legitimately be called-a sandstone, but with many thin, cal- 
careous bands, especially in the lower portion: but north of Peter’s 
Valley the formation rapidly becomes more and more calcareous, until, 
in the Nearpass section, the whole formation is, for the most part, 
limestone, with some thin bands of more or less fissile, greenish shale. 
Only about two feet at the very base of the formation, immediately 
on top of the Bossardville limestone, show any indication of being 
arenaceous, and even this is an earthy limestone, with a small per- 
centage of siliceous matter, rather than a true sandstone. 
In New Jersey the Decker Ferry formation is usually fossiliferous,. 
sometimes highly so, but in many instances the fossils are poorly 
* Second Geol. Surv. Penn., Rep. G. 6, pp. 137-141. 
