FORMATIONS OF DEVONIAN AGE. 93 
of some species. This is especially noticeable in the case of Leptena 
rhombotdalis, which has not been a common species in the earlier 
Helderbergian faunas, but which, in the Becraft limestone, becomes 
especially abundant. 
KINGSTON BEDS. 
Lying above the Becraft limestone, and below the conspicuous 
trilobite bed at the base of the Oriskany formation, there is a series 
of strata which have nowhere been exposed. They are probably shaley 
beds, which are easily disintegrated, and become more or less deeply 
covered with debris. In the Nearpass section these beds occupy the 
‘Interval between the outcrops of the resistant subjacent and super- 
jacent beds, in a shallow depression and in the lower, drift-covered 
portion of the bluff, which is capped by the “trilobite bed.” The 
thickness of the beds at this point is roughly estimated as about 80 
feet. 
No fossils have been collected from this formation, so that the 
only basis for the correlation of the beds is their stratigraphical posi- 
tion, which corresponds with that of the Kingston beds of the New 
York section. In Pennsylvania these same beds have been called the 
Stormville shales, by White.* 
ORISKANY FORMATION. 
Lying above the formation which has been referred to the Kings- 
ton beds there is a series of strata having an aggregate thickness 
estimated at about 170 feet. These beds are, for the most part, 
siliceous limestones, but at the summit of the formation in the south- 
ern half of the Wallpack ridge in New Jersey the higher beds are 
replaced by sandstones. With the southwestern extension of the for- 
mation into Pennsylvania the arenaceous facies becomes more and 
more conspicuous, the sandstones replacing lower and lower beds 
until the entire Oriskany formation is a sandstone continuous with 
the Stormville sandstone or conglomerate, which, in its turn, replaces 
higher and higher beds in its southwestern extension. + 
The fauna of the Oriskany beds in New Jersey is not homogeneous 
* Second Geol. Surv. Penn., Rep. G. 6, p 131, 
{Second Geol. Sury. Penn., Rep. G. 6, p. 133. 
